diff --git a/app/services/vlm_service.py b/app/services/vlm_service.py
index 5a08265..bd7dd64 100644
--- a/app/services/vlm_service.py
+++ b/app/services/vlm_service.py
@@ -13,8 +13,8 @@ from openai import AsyncOpenAI
 
 from app.utils.logger import logger
 
-# 算法类型中文映射
-ALARM_TYPE_NAMES = {
+# VLM 提示词专用名称，与 app.constants.ALARM_TYPE_NAMES 故意不同
+VLM_TYPE_NAMES = {
     "leave_post": "离岗",
     "intrusion": "周界入侵",
     "illegal_parking": "车辆违停",
@@ -137,7 +137,7 @@ class VLMService:
 
         # 选择 prompt 模板
         template = VLM_PROMPTS.get(alarm_type, DEFAULT_PROMPT)
-        alarm_type_name = ALARM_TYPE_NAMES.get(alarm_type, alarm_type)
+        alarm_type_name = VLM_TYPE_NAMES.get(alarm_type, alarm_type)
         prompt = template.format(
             camera_name=camera_name or "未知位置",
             roi_name=roi_name or "监控区域",