diff --git a/par-core/src/main/java/com/par/core/service/impl/AccessResultServiceImpl.java b/par-core/src/main/java/com/par/core/service/impl/AccessResultServiceImpl.java
index 82c59cd..929118a 100644
--- a/par-core/src/main/java/com/par/core/service/impl/AccessResultServiceImpl.java
+++ b/par-core/src/main/java/com/par/core/service/impl/AccessResultServiceImpl.java
@@ -46,7 +46,11 @@ public class AccessResultServiceImpl implements AccessResultService {
     public AccessResult submit(String siteId, String configVersion, String clientId,
                                String contentType, String content, String url,
                                Integer statusCode, Integer responseTimeMs, Long submitterId) {
-        String type = (contentType != null && !contentType.isBlank()) ? contentType : "html";
+        // content_type 只保留简短值（html/json），截断过长的
+        String type = (contentType != null && !contentType.isBlank()) ? 
+                (contentType.length() > 10 ? contentType.substring(0, 10) : contentType) : "html";
+        type = type.contains("json") ? "json" : type.contains("html") ? "html" : 
+                type.length() > 4 ? "html" : type;
         String ext = "json".equalsIgnoreCase(type) ? "json" : "html";
 
         // 去重：5分钟内相同site+url+contentHash跳过