diff --git a/src/core/server/tcp.rs b/src/core/server/tcp.rs
index 940f010..7f8c610 100644
--- a/src/core/server/tcp.rs
+++ b/src/core/server/tcp.rs
@@ -29,7 +29,12 @@ async fn stream_handle(stream: TcpStream, addr: SocketAddr, handler: PacketHandl
         while let Some(data) = receiver.recv().await {
             let len = data.len();
             if let Err(e) = w
-                .write_all(&[0, 0, (len >> 8) as u8, (len & 0xFF) as u8])
+                .write_all(&[
+                    (len >> 24) as u8,
+                    (len >> 16) as u8,
+                    (len >> 8) as u8,
+                    len as u8,
+                ])
                 .await
             {
                 log::info!("发送失败,链接终止:{:?},{:?}", addr, e);
@@ -60,7 +65,10 @@ async fn tcp_read(
     let sender = Some(sender);
     loop {
         read.read_exact(&mut head).await?;
-        let len = ((head[2] as usize) << 8) | head[3] as usize;
+        let len = ((head[0] as usize) << 24)
+            | ((head[1] as usize) << 16)
+            | ((head[2] as usize) << 8)
+            | head[3] as usize;
         if len < 12 || len > buf.len() {
             return Err(io::Error::new(
                 io::ErrorKind::InvalidData,
diff --git a/src/protocol/mod.rs b/src/protocol/mod.rs
index 7bc0bd7..4edc6d3 100644
--- a/src/protocol/mod.rs
+++ b/src/protocol/mod.rs
@@ -126,8 +126,7 @@ impl<B: AsRef<[u8]>> NetPacket<B> {
                 "length overflow",
             ));
         }
-        // 不能大于udp最大载荷长度
-        if !(12..=65535 - 20 - 8).contains(&data_len) {
+        if HEAD_LEN > data_len {
             return Err(io::Error::new(
                 io::ErrorKind::InvalidData,
                 "length overflow",