diff --git a/src/main/java/com/zhangmeng/online/exam/ui/utils/HttpUtils.java b/src/main/java/com/zhangmeng/online/exam/ui/utils/HttpUtils.java
index 1f120cf..20ae58f 100644
--- a/src/main/java/com/zhangmeng/online/exam/ui/utils/HttpUtils.java
+++ b/src/main/java/com/zhangmeng/online/exam/ui/utils/HttpUtils.java
@@ -31,13 +31,17 @@ public class HttpUtils<T> {
     }
 
     public static String GET(String url, Map<String, Object> params) {
-        params.put("token",USER_INFO.get("token"));
+
+        Object token = USER_INFO.get("token");
+        params.put("token",token);
         return HttpUtil.get(url, params);
     }
 
     public static String POST(String url, Map<String, Object> params) {
-        params.put("token",USER_INFO.get("token"));
-        return HttpUtil.post(url, params);
+        HashMap<String, Object> paramMap = new HashMap<>(params);
+        Object token = USER_INFO.get("token");
+        paramMap.put("token",token);
+        return HttpUtil.post(url, paramMap);
     }
 
     public static <T> T POSTFileUPLOAD(String url, Map<String, Object> params, File file, Class<T> clazz) {