diff --git a/frontend/src/components/admin/usage/UsageFilters.vue b/frontend/src/components/admin/usage/UsageFilters.vue
index 6747303708..7ac50aa6b2 100644
--- a/frontend/src/components/admin/usage/UsageFilters.vue
+++ b/frontend/src/components/admin/usage/UsageFilters.vue
@@ -238,6 +238,7 @@ const userKeyword = ref('')
 const userResults = ref<SimpleUser[]>([])
 const showUserDropdown = ref(false)
 let userSearchTimeout: ReturnType<typeof setTimeout> | null = null
+let userSearchSequence = 0
 
 const apiKeyKeyword = ref('')
 const apiKeyResults = ref<SimpleApiKey[]>([])
@@ -307,18 +308,34 @@ const billingModeOptions = ref<SelectOption[]>([
 
 const emitChange = () => emit('change')
 
+const clearPendingUserSearch = () => {
+  if (userSearchTimeout) {
+    clearTimeout(userSearchTimeout)
+    userSearchTimeout = null
+  }
+  userSearchSequence += 1
+}
+
 const debounceUserSearch = () => {
-  if (userSearchTimeout) clearTimeout(userSearchTimeout)
+  clearPendingUserSearch()
+  const query = userKeyword.value.trim()
+  if (!query) {
+    userResults.value = []
+    return
+  }
+
+  const sequence = userSearchSequence
   userSearchTimeout = setTimeout(async () => {
-    if (!userKeyword.value) {
-      userResults.value = []
-      return
-    }
+    userSearchTimeout = null
     try {
-      const results = await adminAPI.usage.searchUsers(userKeyword.value)
-      userResults.value = results.sort((a, b) => Number(a.deleted) - Number(b.deleted))
+      const results = await adminAPI.usage.searchUsers(query)
+      if (sequence === userSearchSequence) {
+        userResults.value = results.sort((a, b) => Number(a.deleted) - Number(b.deleted))
+      }
     } catch {
-      userResults.value = []
+      if (sequence === userSearchSequence) {
+        userResults.value = []
+      }
     }
   }, 300)
 }
@@ -338,6 +355,7 @@ const debounceApiKeySearch = () => {
 }
 
 const selectUser = async (u: SimpleUser) => {
+  clearPendingUserSearch()
   userKeyword.value = u.email
   showUserDropdown.value = false
   filters.value.user_id = u.id
@@ -354,6 +372,7 @@ const selectUser = async (u: SimpleUser) => {
 }
 
 const clearUser = () => {
+  clearPendingUserSearch()
   userKeyword.value = ''
   userResults.value = []
   showUserDropdown.value = false
@@ -453,6 +472,7 @@ watch(
   () => filters.value.user_id,
   (userId) => {
     if (!userId) {
+      clearPendingUserSearch()
       userKeyword.value = ''
       userResults.value = []
     }
@@ -490,11 +510,13 @@ onMounted(async () => {
 })
 
 onUnmounted(() => {
+  clearPendingUserSearch()
   document.removeEventListener('click', onDocumentClick)
 })
 
 // 供外部(如用户排行下钻)在程序化设置 user_id 后回显选中的用户邮箱
 const setUserKeyword = (email: string) => {
+  clearPendingUserSearch()
   userKeyword.value = email
   userResults.value = []
   showUserDropdown.value = false
diff --git a/frontend/src/components/admin/usage/__tests__/UsageFilters.spec.ts b/frontend/src/components/admin/usage/__tests__/UsageFilters.spec.ts
index 3d52385391..491145d4b9 100644
--- a/frontend/src/components/admin/usage/__tests__/UsageFilters.spec.ts
+++ b/frontend/src/components/admin/usage/__tests__/UsageFilters.spec.ts
@@ -99,6 +99,17 @@ function mountFilters(filters = defaultFilters()) {
   })
 }
 
+function deferred<T>() {
+  let resolve!: (value: T | PromiseLike<T>) => void
+  let reject!: (reason?: unknown) => void
+  const promise = new Promise<T>((promiseResolve, promiseReject) => {
+    resolve = promiseResolve
+    reject = promiseReject
+  })
+
+  return { promise, resolve, reject }
+}
+
 describe('UsageFilters — user search dropdown', () => {
   beforeEach(() => {
     vi.useFakeTimers()
@@ -163,6 +174,56 @@ describe('UsageFilters — user search dropdown', () => {
     // (the component uses toRef so modelValue is mutated in place and 'change' is emitted)
     expect(wrapper.props('modelValue').user_id).toBe(1)
   })
+
+  it('keeps results from the latest user search when responses arrive out of order', async () => {
+    const firstSearch = deferred<Array<{ id: number; email: string; deleted: boolean }>>()
+    const secondSearch = deferred<Array<{ id: number; email: string; deleted: boolean }>>()
+    mockSearchUsers
+      .mockImplementationOnce(() => firstSearch.promise)
+      .mockImplementationOnce(() => secondSearch.promise)
+
+    const wrapper = mountFilters()
+    const input = wrapper.find('input[type="text"]')
+    await input.trigger('focus')
+
+    await input.setValue('a')
+    vi.advanceTimersByTime(300)
+    await flushPromises()
+
+    await input.setValue('ab')
+    vi.advanceTimersByTime(300)
+    await flushPromises()
+
+    secondSearch.resolve([{ id: 2, email: 'ab@test.com', deleted: false }])
+    await flushPromises()
+    expect(wrapper.text()).toContain('ab@test.com')
+
+    firstSearch.resolve([{ id: 1, email: 'a@test.com', deleted: false }])
+    await flushPromises()
+    expect(wrapper.text()).toContain('ab@test.com')
+    expect(wrapper.text()).not.toContain('a@test.com')
+  })
+
+  it('does not restore stale user results after the search is cleared', async () => {
+    const pendingSearch = deferred<Array<{ id: number; email: string; deleted: boolean }>>()
+    mockSearchUsers.mockImplementationOnce(() => pendingSearch.promise)
+
+    const wrapper = mountFilters()
+    const input = wrapper.find('input[type="text"]')
+    await input.trigger('focus')
+
+    await input.setValue('stale')
+    vi.advanceTimersByTime(300)
+    await flushPromises()
+
+    await input.setValue('')
+    vi.advanceTimersByTime(300)
+    await flushPromises()
+
+    pendingSearch.resolve([{ id: 3, email: 'stale@test.com', deleted: false }])
+    await flushPromises()
+    expect(wrapper.text()).not.toContain('stale@test.com')
+  })
 })
 
 describe('UsageFilters — model options come from prop (no dup request)', () => {