diff --git a/backend/.env.example b/backend/.env.example
index 8469723e..1b76189a 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -25,7 +25,8 @@ TIMEFLOW_ALIYUN_ASR_WS_URL=wss://{WorkspaceId}.cn-beijing.maas.aliyuncs.com/api-
 TIMEFLOW_ALIYUN_ASR_API_KEY=
 TIMEFLOW_ALIYUN_ASR_MODEL=qwen3-asr-flash-realtime
 TIMEFLOW_ALIYUN_ASR_LANGUAGE=zh
-TIMEFLOW_ALIYUN_ASR_VAD_THRESHOLD=0.0
+# 语音活动检测灵敏度
+TIMEFLOW_ALIYUN_ASR_VAD_THRESHOLD=0.9
 TIMEFLOW_ALIYUN_ASR_VAD_SILENCE_DURATION_MS=400
 TIMEFLOW_ALIYUN_ASR_CONNECT_TIMEOUT_SECONDS=10
 TIMEFLOW_ALIYUN_ASR_FINISH_TIMEOUT_SECONDS=10
@@ -34,7 +35,7 @@ TIMEFLOW_ALIYUN_ASR_FINISH_TIMEOUT_SECONDS=10
 # Empty endpoint/key values are allowed at startup; they are required only when the adapter is used.
 TIMEFLOW_OPENAI_BASE_URL=https://{WorkspaceId}.cn-beijing.maas.aliyuncs.com/compatible-mode/v1
 TIMEFLOW_OPENAI_API_KEY=
-TIMEFLOW_OPENAI_MODEL=qwen-flash
+TIMEFLOW_OPENAI_MODEL=qwen3.6-flash
 TIMEFLOW_OPENAI_TIMEOUT_SECONDS=30
 # Schedule category is optional and fails fast without retrying the provider.
 TIMEFLOW_SCHEDULE_CATEGORY_TIMEOUT_SECONDS=5