diff --git a/src/main/java/com/blade/kit/json/BeanSerializer.java b/src/main/java/com/blade/kit/json/BeanSerializer.java
index 4ada657e7..9d825f58a 100755
--- a/src/main/java/com/blade/kit/json/BeanSerializer.java
+++ b/src/main/java/com/blade/kit/json/BeanSerializer.java
@@ -42,8 +42,9 @@ public static Object serialize(SerializeMapping serializeMapping, Object bean) t
         }
 
         if (bean instanceof Map) {
-            Map map = (Map) bean;
-            map.forEach((Object key, Object value) -> {
+            Map beanMap = (Map) bean;
+            Map map = new HashMap(beanMap.size());
+            beanMap.forEach((Object key, Object value) -> {
                 try {
                     map.put(key, serialize(serializeMapping, value));
                 } catch (Exception e) {