diff --git a/lib/background-uploader/automatic.ts b/lib/background-uploader/automatic.ts
index 764ebef..ddaecc3 100644
--- a/lib/background-uploader/automatic.ts
+++ b/lib/background-uploader/automatic.ts
@@ -1,11 +1,15 @@
 import * as BackgroundTask from 'expo-background-task';
 import * as TaskManager from 'expo-task-manager';
+import pLimit from 'p-limit';
 import { getUploadTaskStatus, initUploadTable, insertUploadTask } from '../db';
 import { getMediaByDateRange } from './media';
 import { processAndUploadMedia } from './uploader';
 
 const BACKGROUND_UPLOAD_TASK = 'background-upload-task';
 
+const CONCURRENCY_LIMIT = 3; // 后台上传并发数，例如同时上传3个文件
+const limit = pLimit(CONCURRENCY_LIMIT);
+
 // 注册后台任务
 export const registerBackgroundUploadTask = async () => {
     try {
@@ -45,38 +49,48 @@ TaskManager.defineTask(BACKGROUND_UPLOAD_TASK, async () => {
 
         console.log(`Found ${media.length} media files to potentially upload.`);
 
-        // 串行上传文件
+        // 并发上传文件
         let successCount = 0;
         let skippedCount = 0;
         let failedCount = 0;
 
-        for (const file of media) {
-            try {
-                const existingTask = await getUploadTaskStatus(file.uri);
-                if (!existingTask) {
-                    // If not in DB, insert as pending
-                    await insertUploadTask(file.uri, file.filename);
-                } else if (existingTask.status === 'success' || existingTask.status === 'skipped') {
-                    console.log(`File ${file.uri} already ${existingTask.status}, skipping processing.`);
-                    skippedCount++;
-                    continue; // Skip processing if already successful or skipped
-                }
+        const uploadPromises = media.map((file) =>
+            limit(async () => {
+                try {
+                    const existingTask = await getUploadTaskStatus(file.uri);
+                    if (!existingTask) {
+                        await insertUploadTask(file.uri, file.filename);
+                    } else if (existingTask.status === 'success' || existingTask.status === 'skipped') {
+                        console.log(`File ${file.uri} already ${existingTask.status}, skipping processing.`);
+                        return { status: 'skipped' }; // 返回状态以便统计
+                    }
 
-                const result = await processAndUploadMedia(file);
-                if (result === null) {
-                    // Skipped by processAndUploadMedia (e.g., already uploaded)
-                    skippedCount++;
-                } else if (result.originalSuccess) {
-                    successCount++;
-                } else {
-                    // Failed
-                    failedCount++;
+                    const result = await processAndUploadMedia(file);
+                    if (result === null) {
+                        return { status: 'skipped' };
+                    } else if (result.originalSuccess) {
+                        return { status: 'success' };
+                    } else {
+                        return { status: 'failed' };
+                    }
+                } catch (e) {
+                    console.error('Upload failed for', file.uri, e);
+                    return { status: 'failed' };
                 }
-            } catch (e) {
-                console.error('Upload failed for', file.uri, e);
+            })
+        );
+
+        const results = await Promise.all(uploadPromises);
+
+        results.forEach(result => {
+            if (result.status === 'success') {
+                successCount++;
+            } else if (result.status === 'skipped') {
+                skippedCount++;
+            } else if (result.status === 'failed') {
                 failedCount++;
             }
-        }
+        });
 
         console.log(`Background upload task finished. Successful: ${successCount}, Skipped: ${skippedCount}, Failed: ${failedCount}, Total: ${media.length}`);
 
diff --git a/package.json b/package.json
index 18d11ef..6013e21 100644
--- a/package.json
+++ b/package.json
@@ -19,6 +19,7 @@
     "@react-navigation/elements": "^2.3.8",
     "@react-navigation/native": "^7.1.6",
     "@reduxjs/toolkit": "^2.8.2",
+    "@types/p-limit": "^2.2.0",
     "@types/react-redux": "^7.1.34",
     "expo": "~53.0.12",
     "expo-audio": "~0.4.7",
@@ -53,6 +54,7 @@
     "i18next-http-backend": "^3.0.2",
     "lottie-react-native": "7.2.2",
     "nativewind": "^4.1.23",
+    "p-limit": "^6.2.0",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "react-i18next": "^15.5.3",