diff --git a/api/roi.py b/api/roi.py
index f5eff0d..9833314 100644
--- a/api/roi.py
+++ b/api/roi.py
@@ -108,7 +108,7 @@ def add_roi(
 ):
     import json
 
-    working_hours_json = json.dumps(request.working_hours) if request.working_hours else None
+    working_hours_json = json.dumps(request.working_hours) if request.working_hours is not None else None
 
     roi = create_roi(
         db,
@@ -153,7 +153,7 @@ def modify_roi(
     db: Session = Depends(get_db),
 ):
     import json
-    working_hours_json = json.dumps(request.working_hours) if request.working_hours else None
+    working_hours_json = json.dumps(request.working_hours) if request.working_hours is not None else None
 
     roi = update_roi(
         db,
diff --git a/config.yaml b/config.yaml
index 74586ea..1c40cfc 100644
--- a/config.yaml
+++ b/config.yaml
@@ -60,12 +60,8 @@ roi:
     - "line"
   max_points: 50  # 多边形最大顶点数
 
-# 工作时间配置（全局默认）
-working_hours:
-  - start: [8, 30]   # 8:30
-    end: [11, 0]     # 11:00
-  - start: [12, 0]   # 12:00
-    end: [17, 30]    # 17:30
+# 工作时间配置（全局默认，空数组表示全天开启）
+working_hours: []
 
 # 算法默认参数
 algorithms: