diff --git a/scripts/md_to_blocks.py b/scripts/md_to_blocks.py
index 3ea1937..640f563 100644
--- a/scripts/md_to_blocks.py
+++ b/scripts/md_to_blocks.py
@@ -12,8 +12,23 @@ import re, json, sys
 TABLE_BLOCK = 31
 CELL_BLOCK = 32
 TEXT_BLOCK = 2
+CODE_BLOCK = 14
 PREFIX = 'ecc_'
 
+LANG_CODES = {
+    '': 1, 'text': 1, 'plain': 1,
+    'bash': 7, 'sh': 7, 'shell': 7,
+    'python': 11, 'py': 11,
+    'go': 5, 'golang': 5,
+    'js': 12, 'javascript': 12, 'json': 14,
+    'yaml': 33, 'yml': 33,
+    'sql': 25,
+}
+
+def lang_code(lang):
+    """Map markdown code fence language to Feishu code block language id."""
+    return LANG_CODES.get(lang.lower(), 1)
+
 def parse_inline(text):
     """Parse a line of inline markdown into text_run elements."""
     elements = []
@@ -176,6 +191,26 @@ def md_to_blocks(md_text):
     while i < len(lines):
         line = lines[i]
 
+        # Fenced code block: ```lang ... ```
+        fence = re.match(r'^```(\w*)\s*$', line.strip())
+        if fence:
+            lang = fence.group(1)
+            code_lines = []
+            i += 1
+            while i < len(lines) and not lines[i].strip().startswith('```'):
+                code_lines.append(lines[i])
+                i += 1
+            i += 1  # skip closing fence
+            code_text = '\n'.join(code_lines)
+            blocks.append({
+                'block_type': CODE_BLOCK,
+                'code': {
+                    'elements': [{'text_run': {'content': code_text, 'text_element_style': {}}}],
+                    'style': {'language': lang_code(lang)}
+                }
+            })
+            continue
+
         # Empty line
         if not line.strip():
             if i + 1 < len(lines) and lines[i + 1].strip() and not lines[i + 1].strip().startswith(('#', '-', '*', '`', '---', '|')):