diff --git a/backend/app/services/contract_content_normalizer.py b/backend/app/services/contract_content_normalizer.py
index 9b2571a8..e81fdd77 100644
--- a/backend/app/services/contract_content_normalizer.py
+++ b/backend/app/services/contract_content_normalizer.py
@@ -4,6 +4,14 @@ from html.parser import HTMLParser
 from typing import Any, Mapping, Optional
 
 
+_MARKDOWN_CODE_FENCE_RE = re.compile(r"^\s*```[a-zA-Z0-9_-]*\s*$")
+_MARKDOWN_HEADING_RE = re.compile(r"^\s{0,3}#{1,6}\s*")
+_MARKDOWN_TRAILING_HEADING_RE = re.compile(r"\s+#{1,6}\s*$")
+_MARKDOWN_BULLET_RE = re.compile(r"^\s*[-*+]\s+")
+_MARKDOWN_BLOCKQUOTE_RE = re.compile(r"^\s*>\s?")
+_MARKDOWN_TABLE_SEPARATOR_RE = re.compile(r"^\s*\|?\s*:?-{3,}:?\s*(\|\s*:?-{3,}:?\s*)+\|?\s*$")
+
+
 class ContractHTMLTextExtractor(HTMLParser):
     _BLOCK_TAGS = {
         "address",
@@ -98,9 +106,9 @@ def normalize_contract_content(value: Any) -> str:
 
     if looks_like_html(text):
         stripped = html_to_text(text)
-        return stripped or text
+        return markdown_to_text(stripped or text)
 
-    return text
+    return markdown_to_text(text)
 
 
 def parse_contract_json_text(value: str) -> Optional[Mapping[str, Any]]:
@@ -127,6 +135,28 @@ def html_to_text(value: str) -> str:
     return parser.get_text()
 
 
+def markdown_to_text(value: str) -> str:
+    lines: list[str] = []
+    for raw_line in str(value or "").splitlines():
+        line = raw_line.strip()
+        if not line:
+            lines.append("")
+            continue
+        if _MARKDOWN_CODE_FENCE_RE.match(line) or _MARKDOWN_TABLE_SEPARATOR_RE.match(line):
+            continue
+        line = _MARKDOWN_BLOCKQUOTE_RE.sub("", line)
+        line = _MARKDOWN_HEADING_RE.sub("", line)
+        line = _MARKDOWN_TRAILING_HEADING_RE.sub("", line)
+        line = _MARKDOWN_BULLET_RE.sub("", line)
+        line = re.sub(r"(\*\*|__)(.*?)\1", r"\2", line)
+        line = re.sub(r"`([^`]+)`", r"\1", line)
+        line = line.replace("\\#", "#").strip()
+        lines.append(line)
+    text = "\n".join(lines)
+    text = re.sub(r"\n{3,}", "\n\n", text)
+    return text.strip()
+
+
 def looks_like_html(value: str) -> bool:
     return bool(re.search(r"</?[a-zA-Z][^>]*>", str(value or "")))
 
diff --git a/backend/app/services/contract_generation_service.py b/backend/app/services/contract_generation_service.py
index f0956dab..402c9479 100644
--- a/backend/app/services/contract_generation_service.py
+++ b/backend/app/services/contract_generation_service.py
@@ -244,6 +244,7 @@ class ContractGenerationService:
                     "prompt_version": prompt_runtime_trace.get("prompt_version"),
                 }
 
+        generated_content = normalize_contract_content(generated_content)
         timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
         file_content, file_name = self.export_service.export_contract(
             generated_content,
@@ -3613,7 +3614,12 @@ class ContractGenerationService:
         related_legal_articles: List[Dict[str, Any]],
         ai_hints: List[Dict[str, Any]],
     ) -> str:
-        body = "".join(f"<p>{escape(part.strip())}</p>" for part in str(content or "").splitlines() if part.strip())
+        paragraphs = [part.strip() for part in normalize_contract_content(content).splitlines() if part.strip()]
+        body_parts = []
+        for part in paragraphs:
+            tag = "h2" if cls._looks_like_contract_heading(part) else "p"
+            body_parts.append(f"<{tag}>{escape(part)}</{tag}>")
+        body = "".join(body_parts)
         if not body:
             body = "<p></p>"
         hint_items = "".join(f"<li>{escape(str(item.get('message') or ''))}</li>" for item in ai_hints)
@@ -3634,6 +3640,18 @@ class ContractGenerationService:
             "</article>"
         )
 
+    @staticmethod
+    def _looks_like_contract_heading(value: str) -> bool:
+        text = str(value or "").strip()
+        if not text:
+            return False
+        return bool(
+            re.match(
+                r"^(?:第[一二三四五六七八九十百千万\d]+[编章节条款]|[一二三四五六七八九十]+[、.．]|[（(][一二三四五六七八九十\d]+[）)]|\d+[、.．])",
+                text,
+            )
+        )
+
     @classmethod
     def _build_alias_values(cls, flattened: Dict[str, Any]) -> Dict[str, Any]:
         party_a = cls._first(flattened, ["party_a.name", "buyer", "buyer_name", "employer.name", "landlord.name"])
diff --git a/backend/tests/test_contract_content_normalizer.py b/backend/tests/test_contract_content_normalizer.py
new file mode 100644
index 00000000..0ddfd5ad
--- /dev/null
+++ b/backend/tests/test_contract_content_normalizer.py
@@ -0,0 +1,49 @@
+import unittest
+
+from app.services.contract_content_normalizer import normalize_contract_content
+from app.services.contract_generation_service import ContractGenerationService
+
+
+class ContractContentNormalizerTestCase(unittest.TestCase):
+    def test_normalize_contract_content_removes_markdown_headings(self):
+        raw_content = """# 劳动合同
+
+### 一、合同期限与试用期
+双方确认合同期限为三年。
+
+### 六、保密、服务期与竞业限制
+**乙方**应履行保密义务。
+"""
+
+        normalized = normalize_contract_content(raw_content)
+
+        self.assertEqual(
+            normalized,
+            "劳动合同\n\n一、合同期限与试用期\n双方确认合同期限为三年。\n\n六、保密、服务期与竞业限制\n乙方应履行保密义务。",
+        )
+        self.assertNotIn("###", normalized)
+        self.assertNotIn("**", normalized)
+
+    def test_normalize_contract_content_removes_markdown_inside_html_payload(self):
+        raw_content = "<article><h1># 劳动合同</h1><p>### 一、合同期限与试用期</p></article>"
+
+        normalized = normalize_contract_content(raw_content)
+
+        self.assertEqual(normalized, "劳动合同\n一、合同期限与试用期")
+        self.assertNotIn("#", normalized)
+
+    def test_generated_contract_html_renders_clean_contract_headings(self):
+        html = ContractGenerationService._build_generated_contract_html(
+            "### 一、合同期限与试用期\n双方确认合同期限为三年。\n### 六、保密、服务期与竞业限制",
+            missing_fields=[],
+            related_legal_articles=[],
+            ai_hints=[],
+        )
+
+        self.assertIn("<h2>一、合同期限与试用期</h2>", html)
+        self.assertIn("<h2>六、保密、服务期与竞业限制</h2>", html)
+        self.assertNotIn("###", html)
+
+
+if __name__ == "__main__":
+    unittest.main()