diff --git a/markbase-core/src/ssh_server/sftp_handler.rs b/markbase-core/src/ssh_server/sftp_handler.rs
index c343b10..f764ab8 100644
--- a/markbase-core/src/ssh_server/sftp_handler.rs
+++ b/markbase-core/src/ssh_server/sftp_handler.rs
@@ -744,16 +744,18 @@ impl SftpHandler {
         Ok(canonical_path)
     }
 
-    /// 构建SSH_FXP_VERSION响应（参考OpenSSH sftp-server.c）
+/// 构建SSH_FXP_VERSION响应（参考OpenSSH sftp-server.c）
     fn build_version_response(&self, version: u32) -> Result<Vec<u8>> {
         let mut buffer = Vec::new();
         
+        // SSH_FXP_VERSION packet
         buffer.write_u8(SftpPacketType::SSH_FXP_VERSION as u8)?;
         buffer.write_u32::<BigEndian>(version)?;
         
-        Ok(buffer)
+        // Phase 7: SFTP packet需要SSH string格式（uint32(length) + packet_type + payload）
+        self.wrap_sftp_packet(&buffer)
     }
-
+    
     /// 构建SSH_FXP_STATUS响应（参考OpenSSH sftp-server.c）
     fn build_status_response(&self, id: u32, status: SftpStatus, message: &str) -> Result<Vec<u8>> {
         let mut buffer = Vec::new();
@@ -767,22 +769,29 @@ impl SftpHandler {
         
         buffer.write_u32::<BigEndian>(0)?;
         
-        Ok(buffer)
+        self.wrap_sftp_packet(&buffer)
     }
-
+    
     /// 构建SSH_FXP_HANDLE响应（参考OpenSSH sftp-server.c）
     fn build_handle_response(&self, id: u32, handle: &[u8]) -> Result<Vec<u8>> {
         let mut buffer = Vec::new();
         
         buffer.write_u8(SftpPacketType::SSH_FXP_HANDLE as u8)?;
         buffer.write_u32::<BigEndian>(id)?;
-        
         buffer.write_u32::<BigEndian>(handle.len() as u32)?;
         buffer.write_all(handle)?;
         
-        Ok(buffer)
+        self.wrap_sftp_packet(&buffer)
     }
-
+    
+    /// Phase 7: 包装SFTP packet为SSH string格式（uint32(length) + packet_type + payload）
+    fn wrap_sftp_packet(&self, packet_data: &[u8]) -> Result<Vec<u8>> {
+        let mut response = Vec::new();
+        response.write_u32::<BigEndian>(packet_data.len() as u32)?;
+        response.write_all(packet_data)?;
+        Ok(response)
+    }
+    
     /// 构建SSH_FXP_DATA响应（参考OpenSSH sftp-server.c）
     fn build_data_response(&self, id: u32, data: &[u8]) -> Result<Vec<u8>> {
         let mut buffer = Vec::new();
@@ -793,9 +802,9 @@ impl SftpHandler {
         buffer.write_u32::<BigEndian>(data.len() as u32)?;
         buffer.write_all(data)?;
         
-        Ok(buffer)
+        self.wrap_sftp_packet(&buffer)
     }
-
+    
     /// 构建SSH_FXP_NAME响应（参考OpenSSH sftp-server.c）
     fn build_name_response(&self, id: u32, entries: Vec<(String, SftpAttrs)>) -> Result<Vec<u8>> {
         let mut buffer = Vec::new();
@@ -815,9 +824,9 @@ impl SftpHandler {
             buffer.write_all(&attrs.serialize())?;
         }
         
-        Ok(buffer)
+        self.wrap_sftp_packet(&buffer)
     }
-
+    
     /// 构建SSH_FXP_ATTRS响应（参考OpenSSH sftp-server.c）
     fn build_attrs_response(&self, id: u32, attrs: &SftpAttrs) -> Result<Vec<u8>> {
         let mut buffer = Vec::new();
@@ -826,7 +835,7 @@ impl SftpHandler {
         buffer.write_u32::<BigEndian>(id)?;
         buffer.write_all(&attrs.serialize())?;
         
-        Ok(buffer)
+        self.wrap_sftp_packet(&buffer)
     }
 }