diff --git a/IRaCIS.Core.Application/Service/ReadingCalculate/ReadingCalculateService.cs b/IRaCIS.Core.Application/Service/ReadingCalculate/ReadingCalculateService.cs
index 4f072aa6..70e8f843 100644
--- a/IRaCIS.Core.Application/Service/ReadingCalculate/ReadingCalculateService.cs
+++ b/IRaCIS.Core.Application/Service/ReadingCalculate/ReadingCalculateService.cs
@@ -71,7 +71,7 @@ namespace IRaCIS.Core.Application.Service.ReadingCalculate
                 {
                      CriterionType thisCriterionType = criterionType.Value;
                     Type thisServiceType = CalculateServiceDic[thisCriterionType];
-                    _useCriterion = _criterionServices.FirstOrDefault(x => x.GetType().Name == nameof(thisServiceType) + "Proxy");
+                    _useCriterion = _criterionServices.FirstOrDefault(x => x.GetType().Name == thisServiceType.GetType().Name + "Proxy");
 
                     if (criterionType == null)
                     {