diff --git a/backend/app/test/test_integration_phase2.py b/backend/app/test/test_integration_phase2.py
index dab6714..271f428 100644
--- a/backend/app/test/test_integration_phase2.py
+++ b/backend/app/test/test_integration_phase2.py
@@ -27,6 +27,7 @@ def video_client(tmp_path, monkeypatch):
     upload_dir.mkdir()
     monkeypatch.setenv("VIDEO_UPLOAD_DIR", str(upload_dir))
     monkeypatch.setenv("MAX_VIDEO_SIZE_MB", "50")
+    monkeypatch.setenv("ASR_PROVIDER", "dashscope")
     monkeypatch.setenv("DASHSCOPE_API_KEY", "sk-test-key")
 
     from app.core.config import get_settings
@@ -49,7 +50,7 @@ def _upload_video(client, filename="test.mp4", content=b"\x00" * 1024):
 class TestUploadTranscribeFlow:
     """Full upload → transcribe with mocked ASR and real file I/O."""
 
-    @patch("app.services.asr_client.OpenAI")
+    @patch("app.services.asr_providers.OpenAI")
     @patch("app.services.video_service.asyncio.create_subprocess_exec")
     def test_upload_then_transcribe(self, mock_subprocess, mock_openai_cls, video_client):
         """Upload video → extract audio (mocked ffmpeg) → transcribe (mocked ASR) → verify response."""
@@ -93,7 +94,7 @@ class TestUploadTranscribeFlow:
         wav_path = upload_dir / f"{video_id}_audio.wav"
         assert not wav_path.exists(), "Temp WAV file should be cleaned up after transcription"
 
-    @patch("app.services.asr_client.OpenAI")
+    @patch("app.services.asr_providers.OpenAI")
     @patch("app.services.video_service.asyncio.create_subprocess_exec")
     def test_upload_transcribe_custom_language(self, mock_subprocess, mock_openai_cls, video_client):
         """Transcribe with language=en should pass it through."""
diff --git a/backend/app/test/test_phase2_asr_client.py b/backend/app/test/test_phase2_asr_client.py
index ef8721b..8eb7ff8 100644
--- a/backend/app/test/test_phase2_asr_client.py
+++ b/backend/app/test/test_phase2_asr_client.py
@@ -123,10 +123,12 @@ class TestToTraditional:
 
 
 class TestTranscribeFull:
-    def test_returns_traditional_chinese_text(self, monkeypatch):
+    @pytest.mark.asyncio
+    async def test_returns_traditional_chinese_text(self, monkeypatch):
         from app.services.asr_client import ASRClient
 
         settings = MagicMock()
+        settings.asr_provider = "dashscope"
         settings.dashscope_api_key = "sk-test-key"
         settings.asr_model_name = "qwen3-asr-flash"
 
@@ -139,8 +141,8 @@ class TestTranscribeFull:
         mock_openai_client = MagicMock()
         mock_openai_client.chat.completions.create.return_value = mock_resp
 
-        with patch("app.services.asr_client.OpenAI", return_value=mock_openai_client):
-            result = client.transcribe_full(b"fake-audio-bytes", language="yue")
+        with patch("app.services.asr_providers.OpenAI", return_value=mock_openai_client):
+            result = await client.transcribe_full(b"fake-audio-bytes", language="yue")
 
         assert result == "測試結果"
         mock_openai_client.chat.completions.create.assert_called_once()
@@ -148,10 +150,12 @@ class TestTranscribeFull:
         assert call_kwargs.kwargs["model"] == "qwen3-asr-flash"
         assert call_kwargs.kwargs["extra_body"]["asr_options"]["language"] == "yue"
 
-    def test_uses_correct_api_endpoint(self, monkeypatch):
+    @pytest.mark.asyncio
+    async def test_uses_correct_api_endpoint(self, monkeypatch):
         from app.services.asr_client import ASRClient
 
         settings = MagicMock()
+        settings.asr_provider = "dashscope"
         settings.dashscope_api_key = "sk-test-key"
         settings.asr_model_name = "qwen3-asr-flash"
 
@@ -164,17 +168,19 @@ class TestTranscribeFull:
         mock_openai_client = MagicMock()
         mock_openai_client.chat.completions.create.return_value = mock_resp
 
-        with patch("app.services.asr_client.OpenAI", return_value=mock_openai_client) as mock_openai_cls:
-            client.transcribe_full(b"audio", language="yue")
+        with patch("app.services.asr_providers.OpenAI", return_value=mock_openai_client) as mock_openai_cls:
+            await client.transcribe_full(b"audio", language="yue")
             mock_openai_cls.assert_called_once_with(
                 api_key="sk-test-key",
                 base_url="https://dashscope-intl.aliyuncs.com/compatible-mode/v1",
             )
 
-    def test_auto_language_omits_language_param(self, monkeypatch):
+    @pytest.mark.asyncio
+    async def test_auto_language_omits_language_param(self, monkeypatch):
         from app.services.asr_client import ASRClient
 
         settings = MagicMock()
+        settings.asr_provider = "dashscope"
         settings.dashscope_api_key = "sk-test-key"
         settings.asr_model_name = "qwen3-asr-flash"
 
@@ -187,8 +193,8 @@ class TestTranscribeFull:
         mock_openai_client = MagicMock()
         mock_openai_client.chat.completions.create.return_value = mock_resp
 
-        with patch("app.services.asr_client.OpenAI", return_value=mock_openai_client):
-            client.transcribe_full(b"audio", language="auto")
+        with patch("app.services.asr_providers.OpenAI", return_value=mock_openai_client):
+            await client.transcribe_full(b"audio", language="auto")
 
         call_kwargs = mock_openai_client.chat.completions.create.call_args
         assert call_kwargs.kwargs.get("extra_body") is None
diff --git a/backend/app/test/test_phase2_full_transcript.py b/backend/app/test/test_phase2_full_transcript.py
index c69a06c..c0f8106 100644
--- a/backend/app/test/test_phase2_full_transcript.py
+++ b/backend/app/test/test_phase2_full_transcript.py
@@ -23,6 +23,7 @@ def video_client(tmp_path, monkeypatch):
     upload_dir.mkdir()
     monkeypatch.setenv("VIDEO_UPLOAD_DIR", str(upload_dir))
     monkeypatch.setenv("MAX_VIDEO_SIZE_MB", "50")
+    monkeypatch.setenv("ASR_PROVIDER", "dashscope")
     monkeypatch.setenv("DASHSCOPE_API_KEY", "sk-test-key")
 
     from app.core.config import get_settings
@@ -44,7 +45,7 @@ def _upload_video(client, filename="test.mp4", content=b"\x00" * 1024):
 
 class TestTranscribeSuccess:
     @patch("app.routers.video.VideoService.extract_audio")
-    @patch("app.services.asr_client.OpenAI")
+    @patch("app.services.asr_providers.OpenAI")
     def test_transcribe_returns_response(self, mock_openai_cls, mock_extract, video_client):
         """POST transcribe should return FullTranscriptResponse."""
         client, upload_dir = video_client
@@ -74,7 +75,7 @@ class TestTranscribeSuccess:
         assert "測" in data["text"] or "試" in data["text"]
 
     @patch("app.routers.video.VideoService.extract_audio")
-    @patch("app.services.asr_client.OpenAI")
+    @patch("app.services.asr_providers.OpenAI")
     def test_transcribe_custom_language(self, mock_openai_cls, mock_extract, video_client):
         """POST transcribe with language param should pass it through."""
         client, upload_dir = video_client
@@ -169,6 +170,7 @@ class TestTranscribeMissingApiKey:
         upload_dir.mkdir()
         monkeypatch.setenv("VIDEO_UPLOAD_DIR", str(upload_dir))
         monkeypatch.setenv("MAX_VIDEO_SIZE_MB", "50")
+        monkeypatch.setenv("ASR_PROVIDER", "dashscope")
         monkeypatch.setenv("DASHSCOPE_API_KEY", "")
 
         from app.core.config import get_settings