diff --git a/Service/AlarmService.cs b/Service/AlarmService.cs
index 8e36402..61610b7 100644
--- a/Service/AlarmService.cs
+++ b/Service/AlarmService.cs
@@ -99,7 +99,7 @@ namespace LY.App.Service
                        .FirstAsync();
                     await _redisService.SetAsync(key, pontion);
                 }
-                var distance = GisHelper.HaversineDistance(lat, lon, pontion.lat, pontion.lat);
+                var distance = GisHelper.HaversineDistance(lat, lon, pontion.lat, pontion.lon);
                 return distance;
             }
             catch (Exception ex)