diff --git a/app/services/alarm_event_service.py b/app/services/alarm_event_service.py
index 4af355c..c0e8dd2 100644
--- a/app/services/alarm_event_service.py
+++ b/app/services/alarm_event_service.py
@@ -8,6 +8,7 @@ from typing import Optional, List, Dict, Any, Tuple
 
 from sqlalchemy import func, cast, Date, Integer, extract, text
 
+from app.constants import ALARM_TYPE_DEFAULT_LEVEL
 from app.models import AlarmEvent, AlarmEventExt, AlarmLlmAnalysis, get_session
 from app.services.oss_storage import get_oss_storage
 from app.utils.logger import logger
@@ -36,14 +37,8 @@ def _determine_alarm_level(
     2. 时长升级：持续型告警随时长升级（只升不降）
     3. 无配置时使用算法默认等级
     """
-    # 算法默认等级
-    default_levels = {
-        "intrusion": 1,         # 重要
-        "leave_post": 2,        # 普通
-        "illegal_parking": 1,   # 重要
-        "vehicle_congestion": 2, # 普通
-    }
-    base_level = initial_level if initial_level is not None else default_levels.get(alarm_type, 2)
+    # 算法默认等级（来自 constants.py 统一定义）
+    base_level = initial_level if initial_level is not None else ALARM_TYPE_DEFAULT_LEVEL.get(alarm_type, 2)
 
     # 入侵检测：事件型，不升级
     if alarm_type == "intrusion":