diff --git a/src/main/java/com/alibaba/druid/pool/PoolableConnection.java b/src/main/java/com/alibaba/druid/pool/PoolableConnection.java
index 4149b21dd7..05fefa3cda 100644
--- a/src/main/java/com/alibaba/druid/pool/PoolableConnection.java
+++ b/src/main/java/com/alibaba/druid/pool/PoolableConnection.java
@@ -447,15 +447,14 @@ public class PoolableConnection implements PooledConnection, Connection {
 
     @Override
     public <T> T unwrap(Class<T> iface) throws SQLException {
-        checkOpen();
-
+        if (conn == null) {
+            return null;
+        }
         return conn.unwrap(iface);
     }
 
     @Override
     public boolean isWrapperFor(Class<?> iface) throws SQLException {
-        checkOpen();
-
         return conn.isWrapperFor(iface);
     }
 
diff --git a/src/main/java/com/alibaba/druid/pool/PoolableResultSet.java b/src/main/java/com/alibaba/druid/pool/PoolableResultSet.java
index 41ae576272..a7bf869585 100644
--- a/src/main/java/com/alibaba/druid/pool/PoolableResultSet.java
+++ b/src/main/java/com/alibaba/druid/pool/PoolableResultSet.java
@@ -42,6 +42,7 @@ public final class PoolableResultSet extends PoolableWrapper implements ResultSe
     private boolean                 closed = false;
 
     public PoolableResultSet(PoolableStatement stmt, ResultSet rs){
+        super(rs);
         this.stmt = stmt;
         this.rs = rs;
     }
diff --git a/src/main/java/com/alibaba/druid/pool/PoolableStatement.java b/src/main/java/com/alibaba/druid/pool/PoolableStatement.java
index d3b74e66ff..24b9dadda3 100644
--- a/src/main/java/com/alibaba/druid/pool/PoolableStatement.java
+++ b/src/main/java/com/alibaba/druid/pool/PoolableStatement.java
@@ -30,14 +30,17 @@ import com.alibaba.druid.logging.LogFactory;
  * @author wenshao<szujobs@hotmail.com>
  */
 public class PoolableStatement extends PoolableWrapper implements Statement {
-    private final static Log LOG = LogFactory.getLog(PoolableStatement.class);
-    
+
+    private final static Log        LOG            = LogFactory.getLog(PoolableStatement.class);
+
     private final Statement         stmt;
     protected PoolableConnection    conn;
     protected final List<ResultSet> resultSetTrace = new ArrayList<ResultSet>();
     protected boolean               closed         = false;
 
     public PoolableStatement(PoolableConnection conn, Statement stmt){
+        super(stmt);
+
         this.conn = conn;
         this.stmt = stmt;
     }
diff --git a/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java b/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java
index a4ebcdbeae..8760665f05 100644
--- a/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java
+++ b/src/main/java/com/alibaba/druid/pool/PoolableWrapper.java
@@ -23,6 +23,12 @@ import java.sql.Wrapper;
  */
 public class PoolableWrapper implements Wrapper {
 
+    private final Wrapper wraaper;
+
+    public PoolableWrapper(Wrapper wraaper){
+        this.wraaper = wraaper;
+    }
+
     @Override
     public boolean isWrapperFor(Class<?> iface) throws SQLException {
         if (iface == null) {
@@ -32,8 +38,12 @@ public class PoolableWrapper implements Wrapper {
         if (iface.isInstance(this)) {
             return true;
         }
+        
+        if (iface.isInstance(wraaper)) {
+            return true;
+        }
 
-        return false;
+        return wraaper.isWrapperFor(iface);
     }
 
     @SuppressWarnings("unchecked")
@@ -46,8 +56,12 @@ public class PoolableWrapper implements Wrapper {
         if (iface.isInstance(this)) {
             return (T) this;
         }
+        
+        if (iface.isInstance(wraaper)) {
+            return (T) wraaper;
+        }
 
-        return null;
+        return wraaper.unwrap(iface);
     }
 
 }
diff --git a/src/test/java/com/alibaba/druid/bvt/pool/Case3.java b/src/test/java/com/alibaba/druid/bvt/pool/Case3.java
index 2eed129cdb..ca3546fe8a 100644
--- a/src/test/java/com/alibaba/druid/bvt/pool/Case3.java
+++ b/src/test/java/com/alibaba/druid/bvt/pool/Case3.java
@@ -3,11 +3,11 @@ package com.alibaba.druid.bvt.pool;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
-import java.sql.Statement;
 
 import junit.framework.Assert;
 import junit.framework.TestCase;
 
+import com.alibaba.druid.mock.MockStatement;
 import com.alibaba.druid.pool.DruidDataSource;
 
 public class Case3 extends TestCase {
@@ -50,14 +50,20 @@ public class Case3 extends TestCase {
         ResultSet rs = stmt.executeQuery();
         rs.next();
 
+        MockStatement mockStmt = stmt.unwrap(MockStatement.class);
+        Assert.assertEquals(false, mockStmt.isClosed());
+
         conn.close();
+        
+        Assert.assertEquals(true, mockStmt.isClosed());
 
         Assert.assertEquals(true, stmt.isClosed());
         Assert.assertEquals(true, rs.isClosed());
 
         rs.close();
         stmt.close();
-        
+
+        stmt.execute("SELECT 1");
 
         dataSource.close();
     }