diff --git a/BBWYB.Server.Business/PurchaseScheme/PurchaseProductAPIService.cs b/BBWYB.Server.Business/PurchaseScheme/PurchaseProductAPIService.cs
index 4cf950c..a4616f7 100644
--- a/BBWYB.Server.Business/PurchaseScheme/PurchaseProductAPIService.cs
+++ b/BBWYB.Server.Business/PurchaseScheme/PurchaseProductAPIService.cs
@@ -29,6 +29,7 @@ namespace BBWYB.Server.Business
 
         public PurchaseProductAPIService(RestApiService restApiService, IMemoryCache memoryCache)
         {
+            this.memoryCache = memoryCache;
             this.restApiService = restApiService;
             _1688ProductDetailRequestHeader = new Dictionary<string, string>()
             {