diff --git a/src/main/java/com/sunyard/sge/database/SydApi4Database.java b/src/main/java/com/sunyard/sge/database/SydApi4Database.java
index f3fcbc9..89bddb3 100644
--- a/src/main/java/com/sunyard/sge/database/SydApi4Database.java
+++ b/src/main/java/com/sunyard/sge/database/SydApi4Database.java
@@ -73,7 +73,7 @@ public class SydApi4Database implements SydApi {
         return this;
     }
 
-    void SYD_Disconnect() {
+    public void SYD_Disconnect() {
         if (null == hsms) {
             return;
         }
diff --git a/src/main/java/com/sunyard/sge/database/pool/SydApiPool.java b/src/main/java/com/sunyard/sge/database/pool/SydApiPool.java
index 8c05e9e..97acd1e 100644
--- a/src/main/java/com/sunyard/sge/database/pool/SydApiPool.java
+++ b/src/main/java/com/sunyard/sge/database/pool/SydApiPool.java
@@ -94,7 +94,10 @@ public class SydApiPool extends ThreadBasedConnectPool<SydApi> {
     // 释放
     protected void free(SydApi o) {
         if ( null != o ) {
-            o.SYD_Disconnect_Ex();
+            if ( o instanceof SydApi4Database ) {
+                ((SydApi4Database)o).SYD_Disconnect();
+            }
+
         }
     }