diff --git a/cmcc/scrip_cmcc_mark.py b/cmcc/scrip_cmcc_mark.py
index a023485..c09e396 100644
--- a/cmcc/scrip_cmcc_mark.py
+++ b/cmcc/scrip_cmcc_mark.py
@@ -157,12 +157,22 @@ def send_notify(title, content):
     sent = False
     if hook:
         try:
-            body = os.environ.get("WEBHOOK_BODY", "").strip()
-            if body:
-                body = body.replace("$title", title).replace("$content", content)
-            else:
+            ct = os.environ.get("WEBHOOK_CONTENT_TYPE", "application/json").strip()
+            tpl = os.environ.get("WEBHOOK_BODY", "").strip()
+            if tpl:
+                body = tpl.replace("$title", title).replace("$content", content)
+                # ★ 模板替换会打破 JSON：content 里有换行/引号时合法 JSON 变非法 → 服务端 400。
+                #   common.js 的做法是 try JSON.parse 失败就重建，这里对齐（2026-11-09 真机 400 即此）。
+                if "json" in ct.lower():
+                    try:
+                        json.loads(body)
+                    except Exception:
+                        body = json.dumps({"title": title, "content": content}, ensure_ascii=False)
+            elif "json" in ct.lower():
                 body = json.dumps({"title": title, "content": content}, ensure_ascii=False)
-            hdrs = {"Content-Type": os.environ.get("WEBHOOK_CONTENT_TYPE", "application/json")}
+            else:
+                body = "title=%s&content=%s" % (title, content)
+            hdrs = {"Content-Type": ct}
             for ln in os.environ.get("WEBHOOK_HEADERS", "").splitlines():
                 if ":" in ln:
                     k, v = ln.split(":", 1)