diff --git a/src/Oms.Application/Services/Orders/PlatformStoreService.cs b/src/Oms.Application/Services/Orders/PlatformStoreService.cs
index 357bffa..71678c3 100644
--- a/src/Oms.Application/Services/Orders/PlatformStoreService.cs
+++ b/src/Oms.Application/Services/Orders/PlatformStoreService.cs
@@ -170,20 +170,37 @@ public class PlatformStoreService : ApplicationService
         var platformCode = input.PlatformCode?.Trim();
         var nickname = input.StoreNickname?.Trim();
         var filter = input.ExpirationFilter?.Trim().ToLowerInvariant();
+        var hasPlatformCode = !string.IsNullOrWhiteSpace(platformCode);
+        var hasNickname = !string.IsNullOrWhiteSpace(nickname);
         var now = DateTime.Now;
         var within7Days = now.AddDays(7);
 
-        return x =>
-            (!hasCustomerFilter || x.CustomerId == customerIdValue)
-            && (string.IsNullOrWhiteSpace(platformCode) || x.PlatformCode == platformCode)
-            && (string.IsNullOrWhiteSpace(nickname) || x.StoreNickname.Contains(nickname))
-            && (string.IsNullOrWhiteSpace(filter) || filter == "normal"
-                ? string.IsNullOrWhiteSpace(filter) || !x.TokenExpireTime.HasValue || x.TokenExpireTime > within7Days
-                : filter == "expired"
-                    ? x.TokenExpireTime.HasValue && x.TokenExpireTime < now
-                    : filter == "within7days"
-                        ? x.TokenExpireTime.HasValue && x.TokenExpireTime >= now && x.TokenExpireTime <= within7Days
-                        : true);
+        // 显式按过期筛选分支构造表达式，避免嵌套三元被 ORM 翻译成非法 IIF。
+        return filter switch
+        {
+            "expired" => x =>
+                (!hasCustomerFilter || x.CustomerId == customerIdValue)
+                && (!hasPlatformCode || x.PlatformCode == platformCode)
+                && (!hasNickname || x.StoreNickname.Contains(nickname!))
+                && x.TokenExpireTime.HasValue
+                && x.TokenExpireTime < now,
+            "within7days" => x =>
+                (!hasCustomerFilter || x.CustomerId == customerIdValue)
+                && (!hasPlatformCode || x.PlatformCode == platformCode)
+                && (!hasNickname || x.StoreNickname.Contains(nickname!))
+                && x.TokenExpireTime.HasValue
+                && x.TokenExpireTime >= now
+                && x.TokenExpireTime <= within7Days,
+            "normal" => x =>
+                (!hasCustomerFilter || x.CustomerId == customerIdValue)
+                && (!hasPlatformCode || x.PlatformCode == platformCode)
+                && (!hasNickname || x.StoreNickname.Contains(nickname!))
+                && (!x.TokenExpireTime.HasValue || x.TokenExpireTime > within7Days),
+            _ => x =>
+                (!hasCustomerFilter || x.CustomerId == customerIdValue)
+                && (!hasPlatformCode || x.PlatformCode == platformCode)
+                && (!hasNickname || x.StoreNickname.Contains(nickname!))
+        };
     }
 
     private static PlatformStoreOutput MapOutput(SalesStore entity) =>