diff --git a/rpc-framework-simple/src/main/java/github/javaguide/serialize/protostuff/ProtostuffSerializer.java b/rpc-framework-simple/src/main/java/github/javaguide/serialize/protostuff/ProtostuffSerializer.java
index 2a0c60c7a7a2aebf0b6798fc06fbf1972a05a611..86f55be49679abfcb8e3edb86f4269eca6515753 100644
--- a/rpc-framework-simple/src/main/java/github/javaguide/serialize/protostuff/ProtostuffSerializer.java
+++ b/rpc-framework-simple/src/main/java/github/javaguide/serialize/protostuff/ProtostuffSerializer.java
@@ -12,20 +12,20 @@ import io.protostuff.runtime.RuntimeSchema;
  */
 public class ProtostuffSerializer implements Serializer {
 
-    /**
-     * Avoid re applying buffer space every time serialization
-     */
-    private static final LinkedBuffer BUFFER = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
-
     @Override
     public byte[] serialize(Object obj) {
+        //1 Avoid re applying buffer space every time serialization
+        //2 Local variables can avoid index out of bounds caused by concurrency
+        //3 Class static variables are prone to exceptions due to concurrency
+        final LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
+
         Class<?> clazz = obj.getClass();
         Schema schema = RuntimeSchema.getSchema(clazz);
         byte[] bytes;
         try {
-            bytes = ProtostuffIOUtil.toByteArray(obj, schema, BUFFER);
+            bytes = ProtostuffIOUtil.toByteArray(obj, schema, buffer);
         } finally {
-            BUFFER.clear();
+            buffer.clear();
         }
         return bytes;
     }