diff --git a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java
index ac3f255f4..bc9758cd6 100755
--- a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java
+++ b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/PojoInstantiator.java
@@ -74,7 +74,7 @@ public class PojoInstantiator implements Instantiator, Serializable {
 	public Object instantiate() {
 		if ( isAbstract ) {
 			try {
-				return DefaultEntityRegister.getInstance().getDefaultEntityClass().newInstance();
+				return DefaultEntityRegister.getInstance().getDefaultEntityClass(mappedClass).newInstance();
 			} catch (Exception e) {
 				throw new InstantiationException("class not found: ", mappedClass);
 			}
diff --git a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java
index fe3932ea7..ec7de7b57 100644
--- a/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java
+++ b/fine-hibernate/src/com/fr/third/org/hibernate/tuple/entity/DefaultEntityRegister.java
@@ -1,12 +1,15 @@
 package com.fr.third.org.hibernate.tuple.entity;
 
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
 /**
  * Created by Zed on 2018/11/1.
  */
 public class DefaultEntityRegister {
 
     private static volatile DefaultEntityRegister instance;
-    private Class defaultEntityClass = null;
+    private static Map<Class, Class> MAP = new ConcurrentHashMap<Class, Class>();
 
     public static DefaultEntityRegister getInstance() {
         if (instance == null) {
@@ -23,19 +26,15 @@ public class DefaultEntityRegister {
 
     }
 
-    public void registerDefaultClass(Class defaultEntityClass) {
-        this.defaultEntityClass = defaultEntityClass;
-    }
-
-    public void resetDefaultClass() {
-        this.defaultEntityClass = null;
+    public void registerDefaultClass(Class abstractEntityClass, Class defaultEntityClass) {
+        MAP.put(abstractEntityClass, defaultEntityClass);
     }
 
-    public Class getDefaultEntityClass() {
-        return defaultEntityClass;
+    public void removeDefaultClass(Class abstractEntityClass) {
+        MAP.remove(abstractEntityClass);
     }
 
-    public void setDefaultEntityClass(Class defaultEntityClass) {
-        this.defaultEntityClass = defaultEntityClass;
+    public Class getDefaultEntityClass(Class abstractEntityClass) {
+        return MAP.get(abstractEntityClass);
     }
 }