diff --git a/ReportEngine/nodes/chapter_generation_node.py b/ReportEngine/nodes/chapter_generation_node.py
index 00ac57a..753dc62 100644
--- a/ReportEngine/nodes/chapter_generation_node.py
+++ b/ReportEngine/nodes/chapter_generation_node.py
@@ -18,6 +18,8 @@ from ..core import TemplateSection, ChapterStorage
 from ..ir import ALLOWED_BLOCK_TYPES, ALLOWED_INLINE_MARKS, IRValidator
 from ..prompts import (
     SYSTEM_PROMPT_CHAPTER_JSON,
+    SYSTEM_PROMPT_CHAPTER_JSON_REPAIR,
+    build_chapter_repair_prompt,
     build_chapter_user_prompt,
 )
 from .base_node import BaseNode
@@ -151,6 +153,20 @@ class ChapterGenerationNode(BaseNode):
         self._sanitize_chapter_blocks(chapter_json)
 
         valid, errors = self.validator.validate_chapter(chapter_json)
+        if not valid and errors:
+            repaired = self._attempt_llm_structural_repair(
+                chapter_json,
+                errors,
+                raw_text=raw_text,
+            )
+            if repaired:
+                chapter_json = repaired
+                chapter_json.setdefault("chapterId", section.chapter_id)
+                chapter_json.setdefault("anchor", section.slug)
+                chapter_json.setdefault("title", section.title)
+                chapter_json.setdefault("order", section.order)
+                self._sanitize_chapter_blocks(chapter_json)
+                valid, errors = self.validator.validate_chapter(chapter_json)
         content_error: ChapterContentError | None = None
         if valid:
             try:
@@ -537,6 +553,36 @@ class ChapterGenerationNode(BaseNode):
         logger.warning("已使用json_repair自动修复章节JSON语法")
         return fixed
 
+    def _attempt_llm_structural_repair(
+        self,
+        chapter: Dict[str, Any],
+        validation_errors: List[str],
+        raw_text: Optional[str] = None,
+    ) -> Optional[Dict[str, Any]]:
+        """将结构性错误的章节交给LLM兜底修复，保持Report Engine相同的API设置。"""
+        if not validation_errors:
+            return None
+        payload = build_chapter_repair_prompt(chapter, validation_errors, raw_text)
+        try:
+            response = self.llm_client.invoke(
+                SYSTEM_PROMPT_CHAPTER_JSON_REPAIR,
+                payload,
+                temperature=0.0,
+                top_p=0.05,
+            )
+        except Exception as exc:  # pragma: no cover - 网络或API异常仅记录
+            logger.error(f"章节JSON LLM修复调用失败: {exc}")
+            return None
+        if not response:
+            return None
+        try:
+            repaired = self._parse_chapter(response)
+        except Exception as exc:
+            logger.error(f"LLM修复后的章节JSON解析失败: {exc}")
+            return None
+        logger.warning("章节JSON经多次本地修复仍不合规，已成功启用LLM兜底修复")
+        return repaired
+
     def _sanitize_chapter_blocks(self, chapter: Dict[str, Any]):
         """
         修正常见的结构性错误（例如list.items嵌套过深）。
diff --git a/ReportEngine/prompts/__init__.py b/ReportEngine/prompts/__init__.py
index 76b1455..8f1f904 100644
--- a/ReportEngine/prompts/__init__.py
+++ b/ReportEngine/prompts/__init__.py
@@ -8,12 +8,14 @@ from .prompts import (
     SYSTEM_PROMPT_TEMPLATE_SELECTION,
     SYSTEM_PROMPT_HTML_GENERATION,
     SYSTEM_PROMPT_CHAPTER_JSON,
+    SYSTEM_PROMPT_CHAPTER_JSON_REPAIR,
     SYSTEM_PROMPT_DOCUMENT_LAYOUT,
     SYSTEM_PROMPT_WORD_BUDGET,
     output_schema_template_selection,
     input_schema_html_generation,
     chapter_generation_input_schema,
     build_chapter_user_prompt,
+    build_chapter_repair_prompt,
     build_document_layout_prompt,
     build_word_budget_prompt,
 )
@@ -22,12 +24,14 @@ __all__ = [
     "SYSTEM_PROMPT_TEMPLATE_SELECTION",
     "SYSTEM_PROMPT_HTML_GENERATION",
     "SYSTEM_PROMPT_CHAPTER_JSON",
+    "SYSTEM_PROMPT_CHAPTER_JSON_REPAIR",
     "SYSTEM_PROMPT_DOCUMENT_LAYOUT",
     "SYSTEM_PROMPT_WORD_BUDGET",
     "output_schema_template_selection",
     "input_schema_html_generation",
     "chapter_generation_input_schema",
     "build_chapter_user_prompt",
+    "build_chapter_repair_prompt",
     "build_document_layout_prompt",
     "build_word_budget_prompt",
 ]
diff --git a/ReportEngine/prompts/prompts.py b/ReportEngine/prompts/prompts.py
index a8170fc..f4a3582 100644
--- a/ReportEngine/prompts/prompts.py
+++ b/ReportEngine/prompts/prompts.py
@@ -9,6 +9,7 @@ import json
 
 from ..ir import (
     ALLOWED_BLOCK_TYPES,
+    ALLOWED_INLINE_MARKS,
     CHAPTER_JSON_SCHEMA_TEXT,
     IR_VERSION,
 )
@@ -317,6 +318,23 @@ SYSTEM_PROMPT_CHAPTER_JSON = f"""
 严禁添加除JSON以外的任何文本或注释。
 """
 
+SYSTEM_PROMPT_CHAPTER_JSON_REPAIR = f"""
+你现在扮演Report Engine的“章节JSON修复官”，负责在章节草稿无法通过IR校验时进行兜底修复。
+
+请牢记：
+1. 所有chapter必须满足IR版本 {IR_VERSION} 约束，仅允许以下block.type：{', '.join(ALLOWED_BLOCK_TYPES)}；
+2. paragraph.inlines中的marks必须来自以下集合：{', '.join(ALLOWED_INLINE_MARKS)}；
+3. 允许的结构、字段与嵌套规则全部写在《CHAPTER JSON SCHEMA》中，任何缺少字段、数组嵌套错误或list.items不是二维数组的情况都必须修复；
+4. 不得更改事实、数值与结论，只能对结构/字段名/嵌套层级做最小修改以通过校验；
+5. 最终输出只能包含合法JSON，格式严格为：{{"chapter": {{...修复后的章节JSON...}}}}，禁止额外解释或Markdown。
+
+<CHAPTER JSON SCHEMA>
+{CHAPTER_JSON_SCHEMA_TEXT}
+</CHAPTER JSON SCHEMA>
+
+只返回JSON，不要添加注释或自然语言。
+"""
+
 # 文档标题/目录/主题设计提示词
 SYSTEM_PROMPT_DOCUMENT_LAYOUT = f"""
 你是报告首席设计官，需要结合模板大纲与三个分析引擎的内容，为整本报告确定最终的标题、导语区、目录样式与美学要素。
@@ -367,6 +385,20 @@ def build_chapter_user_prompt(payload: dict) -> str:
     return json.dumps(payload, ensure_ascii=False, indent=2)
 
 
+def build_chapter_repair_prompt(chapter: dict, errors, original_text=None) -> str:
+    """
+    构造章节修复输入payload，包含原始章节与校验错误。
+    """
+    payload: dict = {
+        "failedChapter": chapter,
+        "validatorErrors": errors,
+    }
+    if original_text:
+        snippet = original_text[-2000:]
+        payload["rawOutputTail"] = snippet
+    return json.dumps(payload, ensure_ascii=False, indent=2)
+
+
 def build_document_layout_prompt(payload: dict) -> str:
     """将文档设计所需的上下文序列化为JSON字符串，供布局节点发送给LLM。"""
     return json.dumps(payload, ensure_ascii=False, indent=2)