diff --git a/packages/backend/src/services/sftp.service.ts b/packages/backend/src/services/sftp.service.ts
index 372771e..0bbc927 100644
--- a/packages/backend/src/services/sftp.service.ts
+++ b/packages/backend/src/services/sftp.service.ts
@@ -64,6 +64,7 @@ interface ActiveUpload {
     stream: WriteStream;
     sessionId: string; // Link back to the session for cleanup
     relativePath?: string;
+    drainPromise?: Promise<void> | null; // +++ For managing drain event listeners +++
 }
 
 export class SftpService {
@@ -1489,6 +1490,7 @@ export class SftpService {
                 stream,
                 sessionId,
                 relativePath, // +++ 存储 relativePath +++
+                drainPromise: null // +++ Initialize drainPromise +++
             };
             this.activeUploads.set(uploadId, uploadState);
 
@@ -1578,21 +1580,45 @@ export class SftpService {
 
             if (!writeSuccess) {
                 // console.warn(`[SFTP Upload ${uploadId}] Write stream buffer full after chunk ${chunkIndex}. Pausing chunk processing until 'drain'.`);
+                if (!uploadState.drainPromise) {
+                    // console.log(`[SFTP Upload ${uploadId}] Attaching new drain listener for chunk ${chunkIndex}`);
+                    uploadState.drainPromise = new Promise<void>(resolve => {
+                        uploadState.stream.once('drain', () => {
+                            // console.log(`[SFTP Upload ${uploadId}] Drain event fired, resolving promise for chunk ${chunkIndex}`);
+                            uploadState.drainPromise = null; // Reset for next time
+                            resolve();
+                        });
+                    });
+                } else {
+                    // console.log(`[SFTP Upload ${uploadId}] Waiting for existing drain promise for chunk ${chunkIndex}`);
+                }
                 try {
-                    await new Promise<void>(resolve => uploadState.stream.once('drain', resolve));
-                    // console.log(`[SFTP Upload ${uploadId}] Write stream drained after chunk ${chunkIndex}. Resuming chunk processing.`);
+                    await uploadState.drainPromise;
+                    // console.log(`[SFTP Upload ${uploadId}] Resumed after drain for chunk ${chunkIndex}`);
                 } catch (drainError) {
-                     // Should not happen with .once, but handle defensively
-                     console.error(`[SFTP Upload ${uploadId}] Error waiting for drain event:`, drainError);
-                     // Consider cancelling upload if waiting for drain fails critically
-                     this.cancelUploadInternal(uploadId, 'Error waiting for drain');
-                     throw drainError; // Re-throw to stop further processing in this chunk handler
+                    console.error(`[SFTP Upload ${uploadId}] Error awaiting drain promise for chunk ${chunkIndex}:`, drainError);
+                    this.cancelUploadInternal(uploadId, 'Error waiting for drain promise');
+                    throw drainError;
                 }
             }
 
-
             uploadState.bytesWritten += chunkBuffer.length;
 
+            // +++ 发送进度更新 +++
+            if (state.ws && state.ws.readyState === WebSocket.OPEN) {
+                const progressPercent = Math.round((uploadState.bytesWritten / uploadState.totalSize) * 100);
+                // 将 uploadId 放在顶层，payload 中包含具体进度数据
+                state.ws.send(JSON.stringify({
+                    type: 'sftp:upload:progress',
+                    uploadId: uploadId,
+                    payload: {
+                        bytesWritten: uploadState.bytesWritten,
+                        totalSize: uploadState.totalSize,
+                        progress: Math.min(100, progressPercent) // 确保不超过100
+                    }
+                }));
+            }
+            // --- 结束发送进度更新 ---
 
             // Check if upload is complete
             if (uploadState.bytesWritten > uploadState.totalSize) {
diff --git a/packages/backend/src/websocket/types.ts b/packages/backend/src/websocket/types.ts
index 2e2801f..6e515f8 100644
--- a/packages/backend/src/websocket/types.ts
+++ b/packages/backend/src/websocket/types.ts
@@ -293,4 +293,11 @@ export interface SftpDecompressErrorPayload {
     error: string;
     details?: string; // Stderr output or specific error details
     requestId: string;
+}
+// S -> C: SFTP Upload Progress (New)
+export interface SftpUploadProgressPayload {
+    uploadId: string; // To correlate with the specific upload
+    bytesWritten: number;
+    totalSize: number;
+    progress: number; // Calculated percentage (0-100)
 }
\ No newline at end of file
diff --git a/packages/frontend/src/composables/useFileUploader.ts b/packages/frontend/src/composables/useFileUploader.ts
index d70d0b1..74c7bc4 100644
--- a/packages/frontend/src/composables/useFileUploader.ts
+++ b/packages/frontend/src/composables/useFileUploader.ts
@@ -75,7 +75,7 @@ export function useFileUploader(
 
                 // --- FIX: Update offset based on the actual chunk size that was read ---
                 offset += currentChunkSize; // Use the stored size of the slice
-                currentUpload.progress = Math.min(100, Math.round((offset / file.size) * 100));
+                // currentUpload.progress = Math.min(100, Math.round((offset / file.size) * 100)); // --- REMOVED: Optimistic progress update
 
                 if (!isLast) {
                     // 使用 requestAnimationFrame 或 nextTick 在块之间添加轻微延迟
@@ -303,6 +303,30 @@ export function useFileUploader(
         }
     };
 
+    // +++ 新增：处理上传进度更新 +++
+    const onUploadProgress = (payload: MessagePayload, message: WebSocketMessage) => {
+        const uploadId = message.uploadId || payload?.uploadId; // 从顶层获取 uploadId
+        if (!uploadId) {
+            console.warn(`[文件上传模块] 收到缺少 uploadId 的 upload:progress 消息:`, message);
+            return;
+        }
+
+        const upload = uploads[uploadId];
+        if (upload && upload.status === 'uploading') {
+            // payload 现在应该包含 bytesWritten 和 totalSize
+            if (typeof payload?.bytesWritten === 'number' && typeof payload?.totalSize === 'number') {
+                upload.progress = Math.min(100, Math.round((payload.bytesWritten / payload.totalSize) * 100));
+                // console.debug(`[文件上传模块] 更新上传 ${uploadId} 进度: ${upload.progress}% (${payload.bytesWritten}/${payload.totalSize})`);
+            } else {
+                console.warn(`[文件上传模块] 收到 upload:progress 消息，但 payload 格式不正确:`, payload);
+            }
+        } else if (upload) {
+            // console.warn(`[文件上传模块] 收到 upload:progress 消息，但上传 ${uploadId} 状态为 ${upload.status}，不予更新。`);
+        } else {
+            console.warn(`[文件上传模块] 收到未知上传 ID 的 upload:progress 消息: ${uploadId}`);
+        }
+    };
+    // --- 结束新增 ---
 
     // --- 注册处理器 ---
     const unregisterUploadReady = onMessage('sftp:upload:ready', onUploadReady);
@@ -311,6 +335,7 @@ export function useFileUploader(
     const unregisterUploadPause = onMessage('sftp:upload:pause', onUploadPause);
     const unregisterUploadResume = onMessage('sftp:upload:resume', onUploadResume);
     const unregisterUploadCancelled = onMessage('sftp:upload:cancelled', onUploadCancelled);
+    const unregisterUploadProgress = onMessage('sftp:upload:progress', onUploadProgress); // +++ 注册新处理器 +++
 
     // --- 清理 ---
     onUnmounted(() => {
@@ -321,6 +346,7 @@ export function useFileUploader(
         unregisterUploadPause?.();
         unregisterUploadResume?.();
         unregisterUploadCancelled?.();
+        unregisterUploadProgress?.(); // +++ 注销新处理器 +++
 
         // 当使用此 composable 的组件卸载时，取消任何正在进行的上传
         Object.keys(uploads).forEach(uploadId => {
diff --git a/packages/frontend/src/types/websocket.types.ts b/packages/frontend/src/types/websocket.types.ts
index 6d953fd..bf0f7de 100644
--- a/packages/frontend/src/types/websocket.types.ts
+++ b/packages/frontend/src/types/websocket.types.ts
@@ -15,6 +15,17 @@ export interface WebSocketMessage {
 
 // 消息处理器函数类型
 export type MessageHandler = (payload: MessagePayload, message: WebSocketMessage) => void; // 恢复 message 参数为必需
+export interface SftpUploadProgressPayload {
+    uploadId: string; // 虽然 uploadId 在 WebSocketMessage 顶层，payload 里也包含以明确关联
+    bytesWritten: number;
+    totalSize: number;
+    progress: number; // 0-100
+}
+export interface SftpUploadProgressMessage extends WebSocketMessage {
+  type: 'sftp:upload:progress';
+  uploadId: string; // uploadId 也在顶层消息中，这里为了明确 payload 关联
+  payload: SftpUploadProgressPayload;
+}
 
 // --- SSH Suspend Mode WebSocket Message Types ---