diff --git a/netty/service/src/main/java/cn/bunny/service/netty/demo3/ByteByteBufAllocator.java b/netty/service/src/main/java/cn/bunny/service/netty/demo3/ByteByteBufAllocator.java
new file mode 100644
index 0000000..199c2f2
--- /dev/null
+++ b/netty/service/src/main/java/cn/bunny/service/netty/demo3/ByteByteBufAllocator.java
@@ -0,0 +1,31 @@
+package cn.bunny.service.netty.demo3;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+
+import static cn.bunny.service.NettyLogUtil.log;
+
+public class ByteByteBufAllocator {
+    public static void main(String[] args) {
+        ByteBuf buf = ByteBufAllocator.DEFAULT.buffer(10);
+        buf.writeBytes(new byte[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10});
+
+        log(buf);
+
+        ByteBuf buf1 = buf.slice(0, 5);
+        buf1.retain();
+        log(buf1);
+
+        ByteBuf buf2 = buf.slice(5, 5);
+        buf2.retain();
+        log(buf2);
+
+        // 释放原有的buf 内容
+        buf.release();
+        log(buf);
+
+        // 释放 buf1和buf2内容
+        buf1.release();
+        buf2.release();
+    }
+}