diff --git a/flutter_app/lib/camera/camera_screen.dart b/flutter_app/lib/camera/camera_screen.dart
index 0a9e383..df8aad8 100644
--- a/flutter_app/lib/camera/camera_screen.dart
+++ b/flutter_app/lib/camera/camera_screen.dart
@@ -147,7 +147,7 @@ class _CameraScreenState extends State<CameraScreen> {
     try {
       await ModelManager.instance
           .refresh()
-          .timeout(const Duration(seconds: 15));
+          .timeout(const Duration(seconds: 30));
     } catch (_) {}
     await _reloadWorker();
     await _startCamera();
diff --git a/flutter_app/lib/models/model_manager.dart b/flutter_app/lib/models/model_manager.dart
index 314ab1d..072494e 100644
--- a/flutter_app/lib/models/model_manager.dart
+++ b/flutter_app/lib/models/model_manager.dart
@@ -164,7 +164,7 @@ class ModelManager extends ChangeNotifier {
       await _loadActive();
       final res = await _client
           .get(Uri.parse('$baseUrl/api/v1/app/update'))
-          .timeout(const Duration(seconds: 8));
+          .timeout(const Duration(seconds: 30));
       // 服务器 Content-Type 无 charset，http 包默认按 latin1 解码会乱码 → 显式 utf8
       final body =
           jsonDecode(utf8.decode(res.bodyBytes)) as Map<String, dynamic>;
@@ -297,15 +297,18 @@ class ModelManager extends ChangeNotifier {
     final sink = part.openWrite();
     var received = 0;
     try {
+      // 下载无总时长上限（大模型慢网可能数分钟）；连接/响应头与数据流
+      // 分别做 30s 停滞判定，避免断流黑洞永久卡死
       final res = await _client
           .send(http.Request('GET', Uri.parse('$baseUrl${item.downloadUrl}')))
-          .timeout(const Duration(minutes: 3));
+          .timeout(const Duration(seconds: 30));
       if (res.statusCode != 200) {
         await sink.close();
         return false;
       }
       final total = res.contentLength ?? item.sizeBytes;
-      await for (final chunk in res.stream) {
+      await for (final chunk
+          in res.stream.timeout(const Duration(seconds: 30))) {
         if (_cancelRequested.contains(item.datasetId)) break; // 用户取消
         sink.add(chunk);
         received += chunk.length;
diff --git a/flutter_app/lib/payment/order_api.dart b/flutter_app/lib/payment/order_api.dart
index 567f4fc..77ff0ec 100644
--- a/flutter_app/lib/payment/order_api.dart
+++ b/flutter_app/lib/payment/order_api.dart
@@ -97,7 +97,7 @@ class OrderApi {
       res = await _client.get(
         Uri.parse('$baseUrl/api/v1/plans'),
         headers: {'Accept': 'application/json', ...await _authHeaders()},
-      ).timeout(const Duration(seconds: 15));
+      ).timeout(const Duration(seconds: 30));
     } catch (e) {
       if (e is OrderApiException) rethrow;
       throw OrderApiException('网络请求失败: $e');
@@ -115,7 +115,7 @@ class OrderApi {
       res = await _client.get(
         Uri.parse('$baseUrl/api/v1/license'),
         headers: {'Accept': 'application/json', ...await _authHeaders()},
-      ).timeout(const Duration(seconds: 15));
+      ).timeout(const Duration(seconds: 30));
     } catch (e) {
       if (e is OrderApiException) rethrow;
       throw OrderApiException('网络请求失败: $e');
@@ -136,7 +136,7 @@ class OrderApi {
             },
             body: body,
           )
-          .timeout(const Duration(seconds: 15));
+          .timeout(const Duration(seconds: 30));
     } catch (e) {
       if (e is OrderApiException) rethrow;
       throw OrderApiException('网络请求失败: $e');
diff --git a/flutter_app/lib/update/update_checker.dart b/flutter_app/lib/update/update_checker.dart
index 817aecc..05ab23f 100644
--- a/flutter_app/lib/update/update_checker.dart
+++ b/flutter_app/lib/update/update_checker.dart
@@ -38,7 +38,7 @@ class UpdateChecker {
     try {
       final res = await _client
           .get(Uri.parse('$baseUrl/api/v1/app/update'))
-          .timeout(const Duration(seconds: 8));
+          .timeout(const Duration(seconds: 30));
       // 服务器 Content-Type 无 charset，http 包默认按 latin1 解码会乱码 → 显式 utf8
       final body =
           jsonDecode(utf8.decode(res.bodyBytes)) as Map<String, dynamic>;
diff --git a/flutter_app/lib/update/update_screen.dart b/flutter_app/lib/update/update_screen.dart
index 282a502..81c5cec 100644
--- a/flutter_app/lib/update/update_screen.dart
+++ b/flutter_app/lib/update/update_screen.dart
@@ -98,14 +98,19 @@ class _UpdateScreenState extends State<UpdateScreen> {
     });
     try {
       if (_apkPart.existsSync()) _apkPart.deleteSync();
-      final res = await _client.send(http.Request('GET', Uri.parse(widget.url)));
+      // 下载无总时长上限（APK 几十 MB 慢网可能数分钟）；连接/响应头与
+      // 数据流分别做 30s 停滞判定，避免断流黑洞永久卡死
+      final res = await _client
+          .send(http.Request('GET', Uri.parse(widget.url)))
+          .timeout(const Duration(seconds: 30));
       if (res.statusCode != 200) {
         throw HttpException('HTTP ${res.statusCode}');
       }
       final total = res.contentLength ?? -1;
       final sink = _apkPart.openWrite();
       var received = 0;
-      await for (final chunk in res.stream) {
+      await for (final chunk
+          in res.stream.timeout(const Duration(seconds: 30))) {
         sink.add(chunk);
         received += chunk.length;
         if (mounted && total > 0) {