diff --git a/src/lib/query/usage.ts b/src/lib/query/usage.ts
index b07cd69e4..fd4e41cb0 100644
--- a/src/lib/query/usage.ts
+++ b/src/lib/query/usage.ts
@@ -1,4 +1,9 @@
-import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import {
+  keepPreviousData,
+  useQuery,
+  useMutation,
+  useQueryClient,
+} from "@tanstack/react-query";
 import { usageApi } from "@/lib/api/usage";
 import { resolveUsageRange } from "@/lib/usageRange";
 import type {
@@ -161,6 +166,8 @@ function normalizeScopeFilters(filters?: UsageScopeFilters): UsageScopeFilters {
 }
 
 // Hooks
+// 统计类查询都带 keepPreviousData：换筛选、时间范围、翻页时先留着上一份数据，
+// 新数据到了再换，不让指标闪成「…」、请求日志表塌成骨架。
 export function useUsageSummary(
   range: UsageRangeSelection,
   filters?: UsageScopeFilters,
@@ -185,6 +192,7 @@ export function useUsageSummary(
         effective.model,
       );
     },
+    placeholderData: keepPreviousData,
     refetchInterval: options?.refetchInterval ?? DEFAULT_REFETCH_INTERVAL_MS,
     refetchIntervalInBackground: options?.refetchIntervalInBackground ?? false,
   });
@@ -212,6 +220,7 @@ export function useUsageSummaryByApp(
         filters?.model,
       );
     },
+    placeholderData: keepPreviousData,
     refetchInterval: options?.refetchInterval ?? DEFAULT_REFETCH_INTERVAL_MS,
     refetchIntervalInBackground: options?.refetchIntervalInBackground ?? false,
   });
@@ -241,6 +250,7 @@ export function useUsageTrends(
         effective.model,
       );
     },
+    placeholderData: keepPreviousData,
     refetchInterval: options?.refetchInterval ?? DEFAULT_REFETCH_INTERVAL_MS,
     refetchIntervalInBackground: options?.refetchIntervalInBackground ?? false,
   });
@@ -270,6 +280,7 @@ export function useProviderStats(
         effective.model,
       );
     },
+    placeholderData: keepPreviousData,
     refetchInterval: options?.refetchInterval ?? DEFAULT_REFETCH_INTERVAL_MS,
     refetchIntervalInBackground: options?.refetchIntervalInBackground ?? false,
   });
@@ -299,6 +310,7 @@ export function useModelStats(
         effective.model,
       );
     },
+    placeholderData: keepPreviousData,
     refetchInterval: options?.refetchInterval ?? DEFAULT_REFETCH_INTERVAL_MS,
     refetchIntervalInBackground: options?.refetchIntervalInBackground ?? false,
   });
@@ -328,6 +340,7 @@ export function useRequestLogs({
       const effectiveFilters = { ...filters, ...resolveUsageRange(range) };
       return usageApi.getRequestLogs(effectiveFilters, page, pageSize);
     },
+    placeholderData: keepPreviousData,
     refetchInterval: options?.refetchInterval ?? DEFAULT_REFETCH_INTERVAL_MS, // 每30秒自动刷新
     refetchIntervalInBackground: options?.refetchIntervalInBackground ?? false,
   });