diff --git a/store/src/main/java/org/apache/rocketmq/store/config/MessageStoreConfig.java b/store/src/main/java/org/apache/rocketmq/store/config/MessageStoreConfig.java
index 60f6a90381c..f79600ce3ab 100644
--- a/store/src/main/java/org/apache/rocketmq/store/config/MessageStoreConfig.java
+++ b/store/src/main/java/org/apache/rocketmq/store/config/MessageStoreConfig.java
@@ -74,6 +74,7 @@ public class MessageStoreConfig {
     private int timerFlushIntervalMs = 1000;
     private int timerGetMessageThreadNum = 3;
     private int timerPutMessageThreadNum = 3;
+    private int timerMessageBufferSize = 512;
 
     private boolean timerEnableDisruptor = false;
 
@@ -1671,6 +1672,14 @@ public void setTimerPutMessageThreadNum(int timerPutMessageThreadNum) {
         this.timerPutMessageThreadNum = timerPutMessageThreadNum;
     }
 
+    public int getTimerMessageBufferSize() {
+        return timerMessageBufferSize;
+    }
+
+    public void setTimerMessageBufferSize(int timerMessageBufferSize) {
+        this.timerMessageBufferSize = timerMessageBufferSize;
+    }
+
     public boolean isTimerEnableDisruptor() {
         return timerEnableDisruptor;
     }
diff --git a/store/src/main/java/org/apache/rocketmq/store/timer/TimerMessageStore.java b/store/src/main/java/org/apache/rocketmq/store/timer/TimerMessageStore.java
index d6af7b84e79..ed12f815808 100644
--- a/store/src/main/java/org/apache/rocketmq/store/timer/TimerMessageStore.java
+++ b/store/src/main/java/org/apache/rocketmq/store/timer/TimerMessageStore.java
@@ -198,7 +198,7 @@ public TimerMessageStore(final MessageStore messageStore, final MessageStoreConf
         bufferLocal = new ThreadLocal<ByteBuffer>() {
             @Override
             protected ByteBuffer initialValue() {
-                return ByteBuffer.allocateDirect(storeConfig.getMaxMessageSize() + 100);
+                return ByteBuffer.allocateDirect(storeConfig.getMaxMessageSize() + storeConfig.getTimerMessageBufferSize());
             }
         };