diff --git a/WeChatApplet/Services/Impl/ClientSideService.cs b/WeChatApplet/Services/Impl/ClientSideService.cs
index 95dd642..96b6fc1 100644
--- a/WeChatApplet/Services/Impl/ClientSideService.cs
+++ b/WeChatApplet/Services/Impl/ClientSideService.cs
@@ -162,25 +162,37 @@ namespace YD_WeChatApplet.Api.Services.Impl
         /// <returns></returns>
         public async Task<bool> PaidCoursesBuy(string redeemCode)
         {
-            var paidCoursesList = new List<Y_CurricularPurchaseRecord>();
-
-            var paidCourses = await _sportsContext.CurricularTaxonomy.Where(x => x.CurricularType == 2).ToListAsync();
-
             var userId = UserLoginContext.Current.UserId;
 
-            foreach (var paidCourse in paidCourses)
-            {
-                paidCoursesList.Add(new Y_CurricularPurchaseRecord()
-                {
-                    TaxonomyId = paidCourse.Id,
-                    UserId = userId,
-                    RedeemCode = redeemCode,
-                    Remarks = "",
-                    CreateDate = DateTime.Now
-                });
-            }
+            // 获取用户已经购买的课程 ID（只查类型为2）
+            var userPurchasedIds = await _sportsContext.CurricularPurchaseRecord
+                .Where(x => x.UserId == userId)
+                .Select(x => x.TaxonomyId)
+                .ToListAsync();
 
-            await _sportsContext.AddRangeAsync(paidCoursesList);
+            // 获取所有类型为2的课程
+            var paidCourses = await _sportsContext.CurricularTaxonomy
+                .Where(x => x.CurricularType == 2)
+                .ToListAsync();
+
+            // 找出用户未购买的课程
+            var newCourses = paidCourses
+                .Where(x => !userPurchasedIds.Contains(x.Id))
+                .ToList();
+
+            if (!newCourses.Any())
+                return true; // 全部已购买，无需再加
+
+            var newRecords = newCourses.Select(course => new Y_CurricularPurchaseRecord
+            {
+                TaxonomyId = course.Id,
+                UserId = userId,
+                RedeemCode = redeemCode,
+                Remarks = "",
+                CreateDate = DateTime.Now
+            }).ToList();
+
+            await _sportsContext.AddRangeAsync(newRecords);
             return await _sportsContext.SaveChangesAsync() > 0;
         }