diff --git a/src/SJZY.Track.Application/Services/TrackOrders/TrackOrderService.cs b/src/SJZY.Track.Application/Services/TrackOrders/TrackOrderService.cs
index 4c63e8a7..6acb8e68 100644
--- a/src/SJZY.Track.Application/Services/TrackOrders/TrackOrderService.cs
+++ b/src/SJZY.Track.Application/Services/TrackOrders/TrackOrderService.cs
@@ -113,7 +113,7 @@ public class TrackOrderService : ApplicationService
     /// <param name="systemId"></param>
     /// <returns></returns>
     [HttpPost("GetDetails")]
-    public async Task<List<TrackOrderDetailDto>> GetTracksAsync(int orderId, string orderNo, int systemId)
+    public async Task<List<TrackOrderDetailDto>> GetTracksAsync(int orderId, string? orderNo, int systemId)
     {
         Expression<Func<OrderEntity, bool>> whereExpression = null;
         if (orderId > 0)