diff --git a/neutrino-proxy-core/src/main/java/org/dromara/neutrinoproxy/core/ProxyMessageEncoder.java b/neutrino-proxy-core/src/main/java/org/dromara/neutrinoproxy/core/ProxyMessageEncoder.java
index 76f1ed3e..a8c660a5 100644
--- a/neutrino-proxy-core/src/main/java/org/dromara/neutrinoproxy/core/ProxyMessageEncoder.java
+++ b/neutrino-proxy-core/src/main/java/org/dromara/neutrinoproxy/core/ProxyMessageEncoder.java
@@ -100,6 +100,7 @@ public class ProxyMessageEncoder extends MessageToByteEncoder<ProxyMessage> {
             byte[] encryptedData = SmEncryptUtil.encryptBySm4(secureKey, data);
             out.writeInt(encryptedData.length);
             out.writeBytes(encryptedData);
+            buf.release();
         }
 
     }