diff --git a/core/common/src/main/java/com/alipay/sofa/rpc/common/json/BeanSerializer.java b/core/common/src/main/java/com/alipay/sofa/rpc/common/json/BeanSerializer.java
index 85cec8437..5b2fddc04 100644
--- a/core/common/src/main/java/com/alipay/sofa/rpc/common/json/BeanSerializer.java
+++ b/core/common/src/main/java/com/alipay/sofa/rpc/common/json/BeanSerializer.java
@@ -84,7 +84,7 @@ public static Object serialize(Object bean, boolean addType) throws NullPointerE
             }
             return array;
         } else if (bean instanceof Map) {
-            Map map = (Map) bean;
+            Map map = new LinkedHashMap<>((Map) bean);
             Iterator itr = map.entrySet().iterator();
             Map.Entry entry = null;
             while (itr.hasNext()) {
@@ -131,8 +131,11 @@ public static Object serialize(Object bean, boolean addType) throws NullPointerE
                     + "." + field.getName() + " error! ", e);
             }
         }
+        if (map.size() == 0) {
+            addType = true;
+        }
         if (addType) {
-            String typeName = beanClass.getCanonicalName();
+            String typeName = beanClass.getName();
             if (!typeName.startsWith("java.")
                 && !typeName.startsWith("javax.")
                 && !typeName.startsWith("sun.")) {
diff --git a/test/test-common/src/main/java/com/alipay/sofa/rpc/test/JSONTest.java b/test/test-common/src/main/java/com/alipay/sofa/rpc/test/JSONTest.java
new file mode 100644
index 000000000..8d31ac0a4
--- /dev/null
+++ b/test/test-common/src/main/java/com/alipay/sofa/rpc/test/JSONTest.java
@@ -0,0 +1,37 @@
+package com.alipay.sofa.rpc.test;
+
+import com.alipay.sofa.rpc.common.json.JSON;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * @author github.com/gofow
+ * @date 2023/02/18 16:55
+ **/
+public class JSONTest {
+
+    public static void main(String[] args) {
+        BeanEntity bean = new JSONTest.BeanEntity();
+
+        Map<String, ? super ValueEntity> map = new HashMap<>();
+        map.put("1", new ValueEntity());
+        bean.map = map;
+
+        String jsonString = JSON.toJSONString(bean);
+        System.out.println(jsonString);
+
+        bean.map.values().forEach(value -> {
+            System.out.println(value.getClass().getSimpleName());
+        });
+
+        BeanEntity ans = JSON.parseObject(jsonString, BeanEntity.class);
+        System.out.println(ans.map.get("1").getClass().getSimpleName());
+    }
+
+    static class BeanEntity {
+        Map<String, ? super ValueEntity> map;
+    }
+
+    static class ValueEntity {}
+}