diff --git a/data/scp_1mb_test.bin b/data/scp_1mb_test.bin
new file mode 100644
index 0000000..e69de29
diff --git a/markbase-core/src/ssh_server/channel.rs b/markbase-core/src/ssh_server/channel.rs
index e3d3d64..a4d71b4 100644
--- a/markbase-core/src/ssh_server/channel.rs
+++ b/markbase-core/src/ssh_server/channel.rs
@@ -123,6 +123,7 @@ impl ChannelManager {
             scp_handler: None,
             rsync_handler: None,
             exec_process: None,  // Phase 14: 交互式exec
+            sftp_input_buffer: Vec::new(),  // ⭐⭐⭐⭐⭐ Phase 14.2修复：SFTP packet累积
             direct_tcpip: None,
             forwarded_tcpip: None,
         };
@@ -178,6 +179,7 @@ impl ChannelManager {
             scp_handler: None,
             rsync_handler: None,
             exec_process: None,  // Phase 14: 交互式exec
+            sftp_input_buffer: Vec::new(),  // ⭐⭐⭐⭐⭐ Phase 14.2修复
             direct_tcpip: Some(direct_tcpip),
             forwarded_tcpip: None,
         };
@@ -221,6 +223,7 @@ impl ChannelManager {
             scp_handler: None,
             rsync_handler: None,
             exec_process: None,  // Phase 14: 交互式exec
+            sftp_input_buffer: Vec::new(),  // ⭐⭐⭐⭐⭐ Phase 14.2修复
             direct_tcpip: None,
             forwarded_tcpip: Some(forwarded_tcpip),
         };
@@ -1290,6 +1293,8 @@ struct Channel {
     scp_handler: Option<ScpHandler>,  // Phase 8: SCP处理器
     rsync_handler: Option<RsyncHandler>,  // Phase 8: rsync处理器
     exec_process: Option<ExecProcess>,  // Phase 14: 交互式exec进程
+    // ⭐⭐⭐⭐⭐ Critical修复：SFTP packet累积buffer
+    sftp_input_buffer: Vec<u8>,  // Phase 14.2修复：累积不完整的SFTP packets
     // Phase 13.3: 端口转发相关字段
     direct_tcpip: Option<DirectTcpipChannel>,  // direct-tcpip channel（Remote forwarding）
     forwarded_tcpip: Option<ForwardedTcpipChannel>,  // forwarded-tcpip channel（Local forwarding）
diff --git a/sftp_1mb_test.bin b/sftp_1mb_test.bin
new file mode 100644
index 0000000..e69de29