diff --git a/app/tree/enhance/__init__.py b/app/tree/repair/__init__.py
similarity index 100%
rename from app/tree/enhance/__init__.py
rename to app/tree/repair/__init__.py
diff --git a/app/tree/repair/regenerator.py b/app/tree/repair/regenerator.py
new file mode 100644
index 0000000..068a669
--- /dev/null
+++ b/app/tree/repair/regenerator.py
@@ -0,0 +1,513 @@
+"""树修复重生成器：VLM 重新描述问题节点 + 底向上级联。
+
+底向上修复流程:
+    1. 收集需修复的 L3 节点 → VLM 重新描述帧
+    2. 收集受影响的 L2 → LLM 从 L3 children 聚合
+    3. 收集受影响的 L1 → LLM 从 L2 children 聚合
+
+仅处理 issue_type == "empty_field" 且 level == 3 的问题节点。
+帧文件不存在时跳过该节点（不中断整体修复流程）。
+"""
+
+from __future__ import annotations
+
+import json
+import re
+from dataclasses import dataclass
+from typing import TYPE_CHECKING, Any
+
+from loguru import logger
+
+from app.tree.index import (
+    L1Card,
+    L1Node,
+    L2Card,
+    L2Node,
+    L3Card,
+    L3Node,
+    TreeIndex,
+)
+from app.tree.subtitle import extract_subtitle_for_range
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    from app.tree.repair.detector import NodeIssue
+    from app.tree.subtitle import SRTEntry
+    from core.protocols import LLMProvider, VLMProvider
+
+# ---------------------------------------------------------------------------
+# Prompt 常量（与 VideoTreeBuilder 保持一致风格）
+# ---------------------------------------------------------------------------
+
+_L3_REPAIR_PROMPT = (
+    '该片段的整体内容: "{l2_description}"\n'
+    "用一到两句话描述这帧画面的具体内容。"
+    "重点关注: 动作、物体变化、文字信息、人物表情。\n"
+    "{subtitle_block}"
+    "返回 JSON 对象，包含以下字段：\n"
+    "- frame_summary: 画面描述\n"
+    "- visible_entities: 可见实体列表\n"
+    "- ongoing_actions: 动作列表\n"
+    "- visible_text: 可见文字列表\n"
+    "- spatial_layout: 空间布局\n"
+    '- visual_attributes: {{"lighting": "...", "dominant_colors": [...], "camera_angle": "..."}}\n'
+    "只返回 JSON 对象，不要其他内容。"
+)
+
+_L2_REGEN_PROMPT = (
+    "以下是一个视频片段中各帧的描述:\n{l3_texts}\n"
+    "用1-2句话描述该片段的核心内容。\n"
+    "返回 JSON 对象，包含以下字段：\n"
+    "- event_description: 1-2句片段描述\n"
+    "- entities: 可见实体列表\n"
+    "- actions: 动作列表\n"
+    "- action_subjects: 动作主体列表\n"
+    "- visible_text: 画面中可见文字列表\n"
+    "- spatial_relations: 空间关系描述\n"
+    "- state_changes: 状态变化描述（无则 null）\n"
+    "只返回 JSON 对象，不要其他内容。"
+)
+
+_L1_REGEN_PROMPT = (
+    "以下是一个视频段落中各片段的描述:\n{l2_texts}\n"
+    "用2-3句话总结该段落的整体内容，涵盖所有片段的主题。\n"
+    "返回 JSON 对象，包含以下字段：\n"
+    "- scene_summary: 2-3句段落摘要\n"
+    "- main_setting: 主要场景\n"
+    "- key_entities: 关键实体列表\n"
+    "- main_actions: 主要动作列表\n"
+    "- topic_keywords: 主题关键词列表\n"
+    "- visible_text: 出现的文字列表\n"
+    "- temporal_flow: 时间流向描述\n"
+    "只返回 JSON 对象，不要其他内容。"
+)
+
+
+# ---------------------------------------------------------------------------
+# 统计数据类
+# ---------------------------------------------------------------------------
+
+
+@dataclass
+class RepairStats:
+    """修复统计信息。
+
+    属性:
+        l3_repaired: 修复的 L3 节点数。
+        l2_regenerated: 重生成的 L2 节点数。
+        l1_regenerated: 重生成的 L1 节点数。
+    """
+
+    l3_repaired: int = 0
+    l2_regenerated: int = 0
+    l1_regenerated: int = 0
+
+
+# ---------------------------------------------------------------------------
+# JSON 解析辅助（复用 VideoTreeBuilder 的解析逻辑）
+# ---------------------------------------------------------------------------
+
+
+def _extract_json(raw: str) -> Any:
+    """从 VLM/LLM 原始输出中提取 JSON（处理 markdown 代码块包裹）。
+
+    参数:
+        raw: 原始返回字符串。
+
+    返回:
+        解析后的 Python 对象（dict/list），解析失败返回 None。
+    """
+    raw = raw.strip()
+    # Phase 1: 尝试提取 markdown 代码块中的 JSON
+    code_match = re.search(
+        r"```(?:json)?\s*([\[{].*?[\]}])\s*```",
+        raw,
+        re.DOTALL,
+    )
+    if code_match:
+        raw = code_match.group(1)
+
+    # Phase 2: 直接解析
+    try:
+        return json.loads(raw)
+    except json.JSONDecodeError:
+        pass
+
+    # Phase 3: 尝试提取裸 JSON 对象/数组
+    json_match = re.search(r"[\[{].*[\]}]", raw, re.DOTALL)
+    if json_match:
+        try:
+            return json.loads(json_match.group())
+        except json.JSONDecodeError:
+            pass
+
+    return None
+
+
+def _parse_l3_card(raw: str) -> L3Card | None:
+    """解析 VLM 输出为 L3Card。解析失败返回 None。
+
+    参数:
+        raw: VLM 原始返回字符串。
+
+    返回:
+        L3Card 实例或 None（解析失败时）。
+    """
+    data = _extract_json(raw)
+    if isinstance(data, dict):
+        try:
+            return L3Card(
+                frame_summary=str(data["frame_summary"]),
+                visible_entities=list(data["visible_entities"]),
+                ongoing_actions=list(data["ongoing_actions"]),
+                visible_text=list(data["visible_text"]),
+                spatial_layout=str(data["spatial_layout"]),
+                visual_attributes=dict(data["visual_attributes"]),
+            )
+        except (KeyError, TypeError, ValueError):
+            pass
+    return None
+
+
+def _parse_l2_card(raw: str) -> L2Card | None:
+    """解析 LLM 输出为 L2Card。解析失败返回 None。
+
+    参数:
+        raw: LLM 原始返回字符串。
+
+    返回:
+        L2Card 实例或 None（解析失败时）。
+    """
+    data = _extract_json(raw)
+    if isinstance(data, dict):
+        try:
+            state_changes = data.get("state_changes")
+            if state_changes is not None:
+                state_changes = str(state_changes)
+            return L2Card(
+                event_description=str(data["event_description"]),
+                entities=list(data["entities"]),
+                actions=list(data["actions"]),
+                action_subjects=list(data["action_subjects"]),
+                visible_text=list(data["visible_text"]),
+                spatial_relations=str(data["spatial_relations"]),
+                state_changes=state_changes,
+            )
+        except (KeyError, TypeError, ValueError):
+            pass
+    return None
+
+
+def _parse_l1_card(raw: str) -> L1Card | None:
+    """解析 LLM 输出为 L1Card。解析失败返回 None。
+
+    参数:
+        raw: LLM 原始返回字符串。
+
+    返回:
+        L1Card 实例或 None（解析失败时）。
+    """
+    data = _extract_json(raw)
+    if isinstance(data, dict):
+        try:
+            return L1Card(
+                scene_summary=str(data["scene_summary"]),
+                main_setting=str(data["main_setting"]),
+                key_entities=list(data["key_entities"]),
+                main_actions=list(data["main_actions"]),
+                topic_keywords=list(data["topic_keywords"]),
+                visible_text=list(data["visible_text"]),
+                temporal_flow=str(data["temporal_flow"]),
+            )
+        except (KeyError, TypeError, ValueError):
+            pass
+    return None
+
+
+# ---------------------------------------------------------------------------
+# 节点查找辅助
+# ---------------------------------------------------------------------------
+
+
+def _build_node_lookup(
+    index: TreeIndex,
+) -> tuple[
+    dict[str, L3Node],
+    dict[str, L2Node],
+    dict[str, L1Node],
+    dict[str, L2Node],
+    dict[str, L1Node],
+]:
+    """构建节点 ID 到节点的查找表 + 子节点到父节点的映射。
+
+    参数:
+        index: 树索引。
+
+    返回:
+        (l3_by_id, l2_by_id, l1_by_id, l3_parent_l2, l2_parent_l1)
+        - l3_by_id: L3 节点 ID → L3Node
+        - l2_by_id: L2 节点 ID → L2Node
+        - l1_by_id: L1 节点 ID → L1Node
+        - l3_parent_l2: L3 节点 ID → 其父 L2Node
+        - l2_parent_l1: L2 节点 ID → 其父 L1Node
+    """
+    l3_by_id: dict[str, L3Node] = {}
+    l2_by_id: dict[str, L2Node] = {}
+    l1_by_id: dict[str, L1Node] = {}
+    l3_parent_l2: dict[str, L2Node] = {}
+    l2_parent_l1: dict[str, L1Node] = {}
+
+    for l1 in index.roots:
+        l1_by_id[l1.id] = l1
+        for l2 in l1.children:
+            l2_by_id[l2.id] = l2
+            l2_parent_l1[l2.id] = l1
+            for l3 in l2.children:
+                l3_by_id[l3.id] = l3
+                l3_parent_l2[l3.id] = l2
+
+    return l3_by_id, l2_by_id, l1_by_id, l3_parent_l2, l2_parent_l1
+
+
+# ---------------------------------------------------------------------------
+# 字幕辅助
+# ---------------------------------------------------------------------------
+
+
+def _build_subtitle_block(
+    srt_entries: list[SRTEntry] | None,
+    timestamp: float | None,
+) -> str:
+    """构建字幕注入文本块。
+
+    参数:
+        srt_entries: SRT 字幕条目列表。
+        timestamp: 帧时间戳（秒）。
+
+    返回:
+        字幕文本块字符串（无匹配时返回空字符串）。
+    """
+    if not srt_entries or timestamp is None:
+        return ""
+    window = 2.0
+    start = max(0.0, timestamp - window)
+    end = timestamp + window
+    text = extract_subtitle_for_range(srt_entries, (start, end))
+    if not text:
+        return ""
+    return f"字幕信息：\n{text}\n"
+
+
+# ---------------------------------------------------------------------------
+# 主修复函数
+# ---------------------------------------------------------------------------
+
+
+async def repair_tree(
+    index: TreeIndex,
+    issues: list[NodeIssue],
+    vlm: VLMProvider,
+    llm: LLMProvider,
+    frames_dir: Path,
+    srt_entries: list[SRTEntry] | None = None,
+) -> RepairStats:
+    """修复有问题的节点，底向上级联。
+
+    流程:
+        1. 收集需修复的 L3 节点 → VLM 重新描述帧
+        2. 收集受影响的 L2 → LLM 从 L3 children 聚合
+        3. 收集受影响的 L1 → LLM 从 L2 children 聚合
+
+    参数:
+        index: 待修复的 TreeIndex（原地修改）。
+        issues: detect_issues() 返回的问题列表。
+        vlm: VLM 调用端口。
+        llm: LLM 调用端口。
+        frames_dir: 帧文件根目录。
+        srt_entries: 字幕条目列表（可选）。
+
+    返回:
+        RepairStats 统计。
+    """
+    stats = RepairStats()
+
+    if not issues:
+        logger.info("无修复任务，跳过")
+        return stats
+
+    # 构建查找表
+    l3_by_id, l2_by_id, l1_by_id, l3_parent_l2, l2_parent_l1 = _build_node_lookup(index)
+
+    # Step 1: 修复 L3 节点（仅处理 empty_field + level 3）
+    l3_issues = [
+        issue for issue in issues if issue.issue_type == "empty_field" and issue.level == 3
+    ]
+
+    affected_l2_ids: set[str] = set()
+
+    for issue in l3_issues:
+        l3_node = l3_by_id.get(issue.node_id)
+        if l3_node is None:
+            logger.warning(
+                "L3 节点 ID 未在树中找到，跳过",
+                node_id=issue.node_id,
+            )
+            continue
+
+        # 查找帧文件
+        if l3_node.frame_path is None:
+            logger.warning(
+                "L3 节点无 frame_path，跳过",
+                node_id=issue.node_id,
+            )
+            continue
+
+        frame_file = frames_dir / l3_node.frame_path
+        if not frame_file.exists():
+            logger.warning(
+                "L3 帧文件不存在，跳过修复",
+                node_id=issue.node_id,
+                frame_path=str(frame_file),
+            )
+            continue
+
+        # 获取 L2 父节点描述作为上下文
+        parent_l2 = l3_parent_l2.get(issue.node_id)
+        l2_description = parent_l2.card.event_description if parent_l2 else ""
+
+        # 构建字幕块
+        subtitle_block = _build_subtitle_block(srt_entries, l3_node.timestamp)
+
+        # VLM 重新描述帧
+        prompt = _L3_REPAIR_PROMPT.format(
+            l2_description=l2_description,
+            subtitle_block=subtitle_block,
+        )
+        messages = [{"role": "user", "content": prompt}]
+
+        try:
+            response = await vlm.chat_with_images(messages, [str(frame_file)])
+        except Exception as exc:
+            logger.warning(
+                "L3 修复 VLM 调用失败，跳过: {}",
+                exc,
+                node_id=issue.node_id,
+            )
+            continue
+
+        new_card = _parse_l3_card(response.content)
+        if new_card is None:
+            logger.warning(
+                "L3 修复 VLM 输出解析失败，跳过",
+                node_id=issue.node_id,
+                raw_preview=response.content[:200],
+            )
+            continue
+
+        # 原地替换 card（L3Node.card 不是 frozen dataclass 的限制字段）
+        l3_node.card = new_card
+        stats.l3_repaired += 1
+
+        # 标记受影响的 L2 父节点
+        if parent_l2 is not None:
+            affected_l2_ids.add(parent_l2.id)
+
+        logger.debug(
+            "L3 节点修复完成",
+            node_id=issue.node_id,
+            frame_summary=new_card.frame_summary[:50],
+        )
+
+    # Step 2: 重生成受影响的 L2 节点
+    affected_l1_ids: set[str] = set()
+
+    for l2_id in affected_l2_ids:
+        l2_node = l2_by_id.get(l2_id)
+        if l2_node is None:
+            continue
+
+        # 从 L3 children 聚合描述
+        l3_texts = "\n".join(f"- {l3.card.frame_summary}" for l3 in l2_node.children)
+        prompt = _L2_REGEN_PROMPT.format(l3_texts=l3_texts)
+        messages = [{"role": "user", "content": prompt}]
+
+        try:
+            response = await llm.chat(messages)
+        except Exception as exc:
+            logger.warning(
+                "L2 重生成 LLM 调用失败，跳过: {}",
+                exc,
+                l2_id=l2_id,
+            )
+            continue
+
+        new_card = _parse_l2_card(response.content)
+        if new_card is None:
+            logger.warning(
+                "L2 重生成 LLM 输出解析失败，跳过",
+                l2_id=l2_id,
+                raw_preview=response.content[:200],
+            )
+            continue
+
+        l2_node.card = new_card
+        stats.l2_regenerated += 1
+
+        # 标记受影响的 L1 父节点
+        parent_l1 = l2_parent_l1.get(l2_id)
+        if parent_l1 is not None:
+            affected_l1_ids.add(parent_l1.id)
+
+        logger.debug(
+            "L2 节点重生成完成",
+            l2_id=l2_id,
+            event_description=new_card.event_description[:50],
+        )
+
+    # Step 3: 重生成受影响的 L1 节点
+    for l1_id in affected_l1_ids:
+        l1_node = l1_by_id.get(l1_id)
+        if l1_node is None:
+            continue
+
+        # 从 L2 children 聚合描述
+        l2_texts = "\n".join(f"- {l2.card.event_description}" for l2 in l1_node.children)
+        prompt = _L1_REGEN_PROMPT.format(l2_texts=l2_texts)
+        messages = [{"role": "user", "content": prompt}]
+
+        try:
+            response = await llm.chat(messages)
+        except Exception as exc:
+            logger.warning(
+                "L1 重生成 LLM 调用失败，跳过: {}",
+                exc,
+                l1_id=l1_id,
+            )
+            continue
+
+        new_card = _parse_l1_card(response.content)
+        if new_card is None:
+            logger.warning(
+                "L1 重生成 LLM 输出解析失败，跳过",
+                l1_id=l1_id,
+                raw_preview=response.content[:200],
+            )
+            continue
+
+        l1_node.card = new_card
+        stats.l1_regenerated += 1
+
+        logger.debug(
+            "L1 节点重生成完成",
+            l1_id=l1_id,
+            scene_summary=new_card.scene_summary[:50],
+        )
+
+    logger.info(
+        "树修复完成",
+        l3_repaired=stats.l3_repaired,
+        l2_regenerated=stats.l2_regenerated,
+        l1_regenerated=stats.l1_regenerated,
+    )
+    return stats
diff --git a/app/tree/repair/supplement.py b/app/tree/repair/supplement.py
index 3924896..499ec5b 100644
--- a/app/tree/repair/supplement.py
+++ b/app/tree/repair/supplement.py
@@ -84,10 +84,11 @@ def deduplicate_field(values: list[str]) -> list[str]:
     seen: set[str] = set()
     result: list[str] = []
     for v in values:
-        key = v.strip().lower()
+        s = str(v).strip()
+        key = s.lower()
         if key and key not in seen:
             seen.add(key)
-            result.append(v)
+            result.append(s)
     return result
 
 
@@ -278,7 +279,7 @@ def apply_injections(index: TreeIndex, injections: list[dict[str, Any]]) -> Supp
             stats.facts_skipped += 1
             continue
 
-        inject_value = instr.get("inject_value", "")
+        inject_value = str(instr.get("inject_value", "")).strip()
         if not inject_value:
             stats.facts_skipped += 1
             continue
diff --git a/core/evolution/patch.py b/core/evolution/patch.py
index d4cef82..87effa5 100644
--- a/core/evolution/patch.py
+++ b/core/evolution/patch.py
@@ -15,9 +15,7 @@ APPENDIX_MAX_CHARS = 2000  # appendix 区软上限（守设计「长度上限+wa
 MOMENTUM_START = "<!-- MOMENTUM_START -->"
 MOMENTUM_END = "<!-- MOMENTUM_END -->"
 MOMENTUM_MAX_CHARS = 2000  # momentum 区软上限（与 appendix 一致：超限 warning 不截断）
-MOMENTUM_HEADING = (
-    "## 动量指导（每轮重写，勿手改）"  # replace_momentum 写入的固定标题行
-)
+MOMENTUM_HEADING = "## 动量指导（每轮重写，勿手改）"  # replace_momentum 写入的固定标题行
 
 
 def momentum_region_bounds(text: str) -> tuple[int, int] | None:
@@ -303,9 +301,7 @@ def _insert_at(content: str, at: int, payload: str) -> str:
     return head + "\n\n" + payload + "\n"
 
 
-def _do_append(
-    content: str, payload: str, ranges: list[tuple[int, int]]
-) -> tuple[str, str]:
+def _do_append(content: str, payload: str, ranges: list[tuple[int, int]]) -> tuple[str, str]:
     """执行 append 操作，返回更新后内容与状态字符串。"""
     return _insert_at(content, _append_at(content, ranges), payload), "applied_append"
 
@@ -351,9 +347,7 @@ def _do_replace_delete(
     return new_content, "applied_" + op
 
 
-def _apply_one(
-    content: str, edit: dict, ranges: list[tuple[int, int]]
-) -> tuple[str, dict]:
+def _apply_one(content: str, edit: dict, ranges: list[tuple[int, int]]) -> tuple[str, dict]:
     """应用单条 edit，返回 (更新后内容, 状态报告)。"""
     if not isinstance(edit, dict):
         return content, {
@@ -382,9 +376,7 @@ def _apply_one(
         return content, report
 
     if op in ("replace", "delete"):
-        content, report["status"] = _do_replace_delete(
-            op, content, target, payload, ranges
-        )
+        content, report["status"] = _do_replace_delete(op, content, target, payload, ranges)
         return content, report
 
     logger.warning("未知 op，跳过: {}", op)
diff --git a/scripts/repair_trees.sh b/scripts/repair_trees.sh
index 2f20f37..b228117 100755
--- a/scripts/repair_trees.sh
+++ b/scripts/repair_trees.sh
@@ -17,6 +17,8 @@ set -euo pipefail
 
 CONCURRENCY="${CONCURRENCY:-16}"
 
+# shellcheck source=/dev/null
+source "$(conda info --base)/etc/profile.d/conda.sh"
 conda activate Video-Tree-TRM
 
 python tools/repair_trees.py \
diff --git a/tests/unit/test_repair_regenerator.py b/tests/unit/test_repair_regenerator.py
new file mode 100644
index 0000000..6d58630
--- /dev/null
+++ b/tests/unit/test_repair_regenerator.py
@@ -0,0 +1,293 @@
+"""修复重生成器单元测试。"""
+
+from __future__ import annotations
+
+import asyncio
+import json
+from pathlib import Path
+
+from app.tree.index import (
+    IndexMeta,
+    L1Card,
+    L1Node,
+    L2Card,
+    L2Node,
+    L3Card,
+    L3Node,
+    TreeIndex,
+)
+from app.tree.repair.detector import NodeIssue
+from app.tree.repair.regenerator import RepairStats, repair_tree
+from core.types import LLMResponse
+
+
+def _mock_response(content: str) -> LLMResponse:
+    """构造模拟 LLMResponse。"""
+    return LLMResponse(
+        content=content,
+        thinking="",
+        model="mock",
+        provider="mock",
+        prompt_tokens=0,
+        completion_tokens=0,
+        latency_ms=0,
+        ttft_ms=None,
+        max_inter_token_ms=None,
+        cache_hit=False,
+        call_id="mock",
+    )
+
+
+class MockVLM:
+    """模拟 VLM 端口，返回固定的 L3Card JSON。"""
+
+    def __init__(self) -> None:
+        self.call_count = 0
+
+    async def chat_with_images(
+        self,
+        messages: list[dict],
+        images: list,
+        **kw: object,
+    ) -> LLMResponse:
+        """模拟 VLM 图文调用。"""
+        self.call_count += 1
+        return _mock_response(
+            json.dumps(
+                {
+                    "frame_summary": "修复后的帧描述",
+                    "visible_entities": ["修复实体"],
+                    "ongoing_actions": ["修复动作"],
+                    "visible_text": [],
+                    "spatial_layout": "居中",
+                    "visual_attributes": {"lighting": "明亮"},
+                }
+            )
+        )
+
+
+class MockLLM:
+    """模拟 LLM 端口，根据 prompt 内容返回 L2Card 或 L1Card JSON。"""
+
+    def __init__(self) -> None:
+        self.call_count = 0
+
+    async def chat(
+        self,
+        messages: list[dict],
+        **kw: object,
+    ) -> LLMResponse:
+        """模拟 LLM 文本调用，按 prompt 内容区分 L2/L1 响应。"""
+        self.call_count += 1
+        content = messages[-1].get("content", "")
+        if "段落" in content or "scene" in content.lower():
+            return _mock_response(
+                json.dumps(
+                    {
+                        "scene_summary": "修复后的场景",
+                        "main_setting": "室内",
+                        "key_entities": [],
+                        "main_actions": [],
+                        "topic_keywords": [],
+                        "visible_text": [],
+                        "temporal_flow": "",
+                    }
+                )
+            )
+        return _mock_response(
+            json.dumps(
+                {
+                    "event_description": "修复后的事件",
+                    "entities": [],
+                    "actions": [],
+                    "action_subjects": [],
+                    "visible_text": [],
+                    "spatial_relations": "",
+                    "state_changes": None,
+                }
+            )
+        )
+
+
+class TestRepairTree:
+    """repair_tree 核心测试。"""
+
+    def _make_broken_tree(
+        self,
+        tmp_path: Path,
+    ) -> tuple[TreeIndex, list[NodeIssue]]:
+        """构建含一个空 frame_summary 的 L3 节点的测试树。"""
+        frame_path = tmp_path / "frames" / "L1_000_L2_000_L3_000.jpg"
+        frame_path.parent.mkdir(parents=True)
+        frame_path.write_bytes(b"\xff\xd8\xff\xe0fake")
+
+        l3 = L3Node(
+            id="vid_L1_000_L2_000_L3_000",
+            card=L3Card("", [], [], [], "", {}),
+            timestamp=1.0,
+            frame_path="frames/L1_000_L2_000_L3_000.jpg",
+        )
+        l2 = L2Node(
+            id="vid_L1_000_L2_000",
+            card=L2Card("原始事件", [], [], [], [], "", None),
+            time_range=(0.0, 10.0),
+            children=[l3],
+        )
+        l1 = L1Node(
+            id="vid_L1_000",
+            card=L1Card("原始场景", "", [], [], [], [], ""),
+            time_range=(0.0, 10.0),
+            children=[l2],
+        )
+        index = TreeIndex(metadata=IndexMeta("/t.mp4", "video"), roots=[l1])
+        issues = [
+            NodeIssue(
+                "vid_L1_000_L2_000_L3_000",
+                3,
+                "empty_field",
+                "frame_summary 为空",
+            )
+        ]
+        return index, issues
+
+    def test_repairs_l3_and_cascades(self, tmp_path: Path) -> None:
+        """修复 L3 后应级联重生成 L2 和 L1。"""
+        index, issues = self._make_broken_tree(tmp_path)
+        stats = asyncio.run(repair_tree(index, issues, MockVLM(), MockLLM(), tmp_path))
+        assert stats.l3_repaired == 1
+        assert stats.l2_regenerated == 1
+        assert stats.l1_regenerated == 1
+        assert index.roots[0].children[0].children[0].card.frame_summary == "修复后的帧描述"
+        assert index.roots[0].children[0].card.event_description == "修复后的事件"
+        assert index.roots[0].card.scene_summary == "修复后的场景"
+
+    def test_no_issues_no_changes(self) -> None:
+        """无问题时不进行任何修复。"""
+        l3 = L3Node(
+            id="l1_0_l2_0_l3_0",
+            card=L3Card("正常", [], [], [], "", {}),
+            timestamp=1.0,
+        )
+        l2 = L2Node(
+            id="l1_0_l2_0",
+            card=L2Card("正常事件", [], [], [], [], "", None),
+            time_range=(0.0, 10.0),
+            children=[l3],
+        )
+        l1 = L1Node(
+            id="l1_0",
+            card=L1Card("正常场景", "", [], [], [], [], ""),
+            time_range=(0.0, 10.0),
+            children=[l2],
+        )
+        index = TreeIndex(metadata=IndexMeta("/t.mp4", "video"), roots=[l1])
+        stats = asyncio.run(repair_tree(index, [], MockVLM(), MockLLM(), Path("/tmp")))
+        assert stats.l3_repaired == 0
+        assert stats.l2_regenerated == 0
+        assert stats.l1_regenerated == 0
+
+    def test_stats_dataclass(self) -> None:
+        """RepairStats 数据类字段验证。"""
+        stats = RepairStats(l3_repaired=2, l2_regenerated=1, l1_regenerated=1)
+        assert stats.l3_repaired == 2
+        assert stats.l2_regenerated == 1
+        assert stats.l1_regenerated == 1
+
+    def test_skips_non_empty_field_issues(self, tmp_path: Path) -> None:
+        """非 empty_field 类型的 issue 不触发 L3 修复。"""
+        l3 = L3Node(
+            id="l1_0_l2_0_l3_0",
+            card=L3Card("正常描述", [], [], [], "", {}),
+            timestamp=1.0,
+        )
+        l2 = L2Node(
+            id="l1_0_l2_0",
+            card=L2Card("原始事件", [], [], [], [], "", None),
+            time_range=(0.0, 10.0),
+            children=[l3],
+        )
+        l1 = L1Node(
+            id="l1_0",
+            card=L1Card("原始场景", "", [], [], [], [], ""),
+            time_range=(0.0, 10.0),
+            children=[l2],
+        )
+        index = TreeIndex(metadata=IndexMeta("/t.mp4", "video"), roots=[l1])
+        issues = [NodeIssue("l1_0_l2_0_l3_0", 3, "missing_frame", "帧文件不存在")]
+        stats = asyncio.run(repair_tree(index, issues, MockVLM(), MockLLM(), tmp_path))
+        assert stats.l3_repaired == 0
+        assert stats.l2_regenerated == 0
+
+    def test_multiple_l3_under_same_l2(self, tmp_path: Path) -> None:
+        """同一 L2 下多个 L3 修复后，L2 只重生成一次。"""
+        frame_dir = tmp_path / "frames"
+        frame_dir.mkdir(parents=True)
+        for i in range(2):
+            (frame_dir / f"f{i}.jpg").write_bytes(b"\xff\xd8\xff\xe0fake")
+
+        l3_a = L3Node(
+            id="l1_0_l2_0_l3_0",
+            card=L3Card("", [], [], [], "", {}),
+            timestamp=1.0,
+            frame_path="frames/f0.jpg",
+        )
+        l3_b = L3Node(
+            id="l1_0_l2_0_l3_1",
+            card=L3Card("", [], [], [], "", {}),
+            timestamp=2.0,
+            frame_path="frames/f1.jpg",
+        )
+        l2 = L2Node(
+            id="l1_0_l2_0",
+            card=L2Card("原始事件", [], [], [], [], "", None),
+            time_range=(0.0, 10.0),
+            children=[l3_a, l3_b],
+        )
+        l1 = L1Node(
+            id="l1_0",
+            card=L1Card("原始场景", "", [], [], [], [], ""),
+            time_range=(0.0, 10.0),
+            children=[l2],
+        )
+        index = TreeIndex(metadata=IndexMeta("/t.mp4", "video"), roots=[l1])
+        issues = [
+            NodeIssue("l1_0_l2_0_l3_0", 3, "empty_field", "frame_summary 为空"),
+            NodeIssue("l1_0_l2_0_l3_1", 3, "empty_field", "frame_summary 为空"),
+        ]
+        vlm = MockVLM()
+        llm = MockLLM()
+        stats = asyncio.run(repair_tree(index, issues, vlm, llm, tmp_path))
+        assert stats.l3_repaired == 2
+        assert stats.l2_regenerated == 1
+        assert stats.l1_regenerated == 1
+        assert vlm.call_count == 2
+        # LLM 应被调用 2 次：一次 L2 + 一次 L1
+        assert llm.call_count == 2
+
+    def test_missing_frame_file_skips_l3(self, tmp_path: Path) -> None:
+        """帧文件不存在时跳过该 L3 节点的修复。"""
+        l3 = L3Node(
+            id="l1_0_l2_0_l3_0",
+            card=L3Card("", [], [], [], "", {}),
+            timestamp=1.0,
+            frame_path="frames/nonexistent.jpg",
+        )
+        l2 = L2Node(
+            id="l1_0_l2_0",
+            card=L2Card("原始事件", [], [], [], [], "", None),
+            time_range=(0.0, 10.0),
+            children=[l3],
+        )
+        l1 = L1Node(
+            id="l1_0",
+            card=L1Card("原始场景", "", [], [], [], [], ""),
+            time_range=(0.0, 10.0),
+            children=[l2],
+        )
+        index = TreeIndex(metadata=IndexMeta("/t.mp4", "video"), roots=[l1])
+        issues = [NodeIssue("l1_0_l2_0_l3_0", 3, "empty_field", "frame_summary 为空")]
+        stats = asyncio.run(repair_tree(index, issues, MockVLM(), MockLLM(), tmp_path))
+        # 帧文件不存在 → 跳过 L3 修复 → 无级联
+        assert stats.l3_repaired == 0
+        assert stats.l2_regenerated == 0
+        assert stats.l1_regenerated == 0
diff --git a/tools/migrate_from_trm4.sh b/tools/migrate_from_trm4.sh
new file mode 100755
index 0000000..ec8abb3
--- /dev/null
+++ b/tools/migrate_from_trm4.sh
@@ -0,0 +1,75 @@
+#!/usr/bin/env bash
+# 从 TRM4.zip 迁移资产到 TRM5
+# 用法: bash tools/migrate_from_trm4.sh /path/to/Video-Tree-TRM4.zip
+set -euo pipefail
+
+ZIP_PATH="${1:?用法: bash tools/migrate_from_trm4.sh /path/to/Video-Tree-TRM4.zip}"
+PROJECT_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+TMP_DIR=$(mktemp -d)
+
+echo "=== TRM4 -> TRM5 迁移 ==="
+echo "ZIP: $ZIP_PATH"
+echo "项目根: $PROJECT_ROOT"
+echo "临时目录: $TMP_DIR"
+
+# 1. 解压
+echo "[1/6] 解压 TRM4.zip..."
+unzip -q "$ZIP_PATH" -d "$TMP_DIR"
+SRC="$TMP_DIR/Video-Tree-TRM4"
+
+# 2. 拷贝帧文件 (rsync --ignore-existing)
+echo "[2/6] 拷贝帧文件..."
+mkdir -p "$PROJECT_ROOT/store/videos"
+for vid_dir in "$SRC"/store/videos/*/; do
+    vid=$(basename "$vid_dir")
+    dst="$PROJECT_ROOT/store/videos/$vid"
+    mkdir -p "$dst"
+    if [ -d "$vid_dir/frames" ]; then
+        rsync -a --ignore-existing "$vid_dir/frames/" "$dst/frames/"
+    fi
+done
+
+# 3. 拷贝 SRT 字幕
+echo "[3/6] 拷贝 SRT 字幕..."
+mkdir -p "$PROJECT_ROOT/data/Video-MME/subtitle"
+if [ -d "$SRC/data/Video-MME/subtitle" ]; then
+    rsync -a --ignore-existing "$SRC/data/Video-MME/subtitle/" "$PROJECT_ROOT/data/Video-MME/subtitle/"
+fi
+
+# 4. 拷贝视频压缩包
+echo "[4/6] 拷贝视频压缩包..."
+mkdir -p "$PROJECT_ROOT/data/Video-MME/original_data"
+if [ -d "$SRC/data/Video-MME/original_data" ]; then
+    rsync -a --ignore-existing "$SRC/data/Video-MME/original_data/" "$PROJECT_ROOT/data/Video-MME/original_data/"
+fi
+
+# 5. 拷贝问题 JSON
+echo "[5/6] 拷贝 Benchmark 问题..."
+mkdir -p "$PROJECT_ROOT/store/questions"
+if [ -d "$SRC/store/questions" ]; then
+    rsync -a --ignore-existing "$SRC/store/questions/" "$PROJECT_ROOT/store/questions/"
+fi
+
+# 6. 格式转换
+echo "[6/6] 格式转换 flat -> TreeIndex..."
+conda run -n Video-Tree-TRM python "$PROJECT_ROOT/tools/convert_flat_to_treeindex.py" \
+    "$SRC/store/videos" "$PROJECT_ROOT/store/videos"
+
+# 验收
+echo ""
+echo "=== 验收检查 ==="
+VIDEO_COUNT=$(find "$PROJECT_ROOT/store/videos" -name "tree.json" | wc -l)
+SRT_COUNT=$(find "$PROJECT_ROOT/data/Video-MME/subtitle" -name "*.srt" 2>/dev/null | wc -l)
+echo "视频树: $VIDEO_COUNT (期望 300)"
+echo "SRT 字幕: $SRT_COUNT (期望 >=290)"
+
+# 清理
+echo "清理临时目录..."
+rm -rf "$TMP_DIR"
+
+if [ "$VIDEO_COUNT" -lt 300 ]; then
+    echo "WARNING: 视频树数量不足 300，请检查"
+    exit 1
+fi
+
+echo "迁移完成"