diff --git a/WebApi_data_value/Controllers/Yuntech_in_car_tableController.cs b/WebApi_data_value/Controllers/Yuntech_in_car_tableController.cs
index 1712315..6eef0e8 100644
--- a/WebApi_data_value/Controllers/Yuntech_in_car_tableController.cs
+++ b/WebApi_data_value/Controllers/Yuntech_in_car_tableController.cs
@@ -274,6 +274,19 @@ namespace Parking_space_WebAPI.Controllers
                 {
                     return Ok();
                 }
+
+                //比對30秒內出去與進入的時間對比
+                //取得30秒前的時間
+                DateTime time_30s_ago = now_time.AddSeconds(-30);
+                var out_car_data = await (from c in _context.yuntech_in_car_table
+                                         where c.license_plate_number == yuntech_in_car_table.license_plate_number
+                                         orderby c.out_time descending
+                                         select c).FirstOrDefaultAsync();
+                if (out_car_data != null && out_car_data.out_time > time_30s_ago)
+                {
+                    return Ok();
+                }
+
                 // 新增資料
                 yuntech_in_car_table.in_time = DateTime.Now;
                 yuntech_in_car_table.out_time = null;