diff --git a/frontend/src/pages/logs/__tests__/operations.spec.ts b/frontend/src/pages/logs/__tests__/operations.spec.ts
index c4110b4..398b2d9 100644
--- a/frontend/src/pages/logs/__tests__/operations.spec.ts
+++ b/frontend/src/pages/logs/__tests__/operations.spec.ts
@@ -83,6 +83,26 @@ const mockUsers = {
   per_page: 200,
 }
 
+const mockRoles = {
+  items: [
+    { id: 3, name: 'developer' },
+    { id: 4, name: 'administrator' },
+  ],
+  total: 2,
+  page: 1,
+  per_page: 200,
+}
+
+const mockRouteGroups = {
+  items: [
+    { id: 10, name: 'default' },
+    { id: 11, name: 'api-management' },
+  ],
+  total: 2,
+  page: 1,
+  per_page: 200,
+}
+
 // ─── Store Tests ───────────────────────────────────────
 
 describe('useOperationLogStore', () => {
@@ -192,27 +212,59 @@ describe('useOperationLogStore', () => {
     })
   })
 
-  describe('userMap', () => {
-    it('S6: builds userMap from loaded users', async () => {
+  describe('lookup maps', () => {
+    it('S6: builds all maps from loaded lookups', async () => {
       const { api } = await import('@/utils/request')
-      vi.mocked(api.get).mockResolvedValueOnce(mockUsers)
+      vi.mocked(api.get)
+        .mockResolvedValueOnce(mockUsers)
+        .mockResolvedValueOnce(mockRoles)
+        .mockResolvedValueOnce(mockRouteGroups)
 
       const store = useOperationLogStore()
       await store.loadLookups()
 
       expect(store.userMap.get(1)).toBe('admin')
       expect(store.userMap.get(2)).toBe('editor')
+      expect(store.roleMap.get(3)).toBe('developer')
+      expect(store.roleMap.get(4)).toBe('administrator')
+      expect(store.routeGroupMap.get(10)).toBe('default')
+      expect(store.routeGroupMap.get(11)).toBe('api-management')
     })
 
-    it('S7: handles loadLookups failure gracefully', async () => {
+    it('S6a: userMap handles string id from API via Number() defense', () => {
+      const store = useOperationLogStore()
+      store.users = [{ id: '1' as any, username: 'admin' }] as any
+      expect(store.userMap.get(1)).toBe('admin')
+    })
+
+    it('S7: handles all lookups failure gracefully', async () => {
       const { api } = await import('@/utils/request')
-      vi.mocked(api.get).mockRejectedValueOnce(new Error('加载失败'))
+      vi.mocked(api.get)
+        .mockRejectedValueOnce(new Error('用户加载失败'))
+        .mockRejectedValueOnce(new Error('角色加载失败'))
+        .mockRejectedValueOnce(new Error('路由组加载失败'))
 
       const store = useOperationLogStore()
       await store.loadLookups()
 
-      expect(store.users).toEqual([])
       expect(store.userMap.size).toBe(0)
+      expect(store.roleMap.size).toBe(0)
+      expect(store.routeGroupMap.size).toBe(0)
+    })
+
+    it('S7a: partial lookup failure does not affect other maps', async () => {
+      const { api } = await import('@/utils/request')
+      vi.mocked(api.get)
+        .mockResolvedValueOnce(mockUsers)
+        .mockRejectedValueOnce(new Error('角色加载失败'))
+        .mockResolvedValueOnce(mockRouteGroups)
+
+      const store = useOperationLogStore()
+      await store.loadLookups()
+
+      expect(store.userMap.get(1)).toBe('admin')
+      expect(store.roleMap.size).toBe(0)
+      expect(store.routeGroupMap.get(10)).toBe('default')
     })
   })
 })
@@ -237,6 +289,8 @@ describe('OperationLogPage', () => {
     const { api } = await import('@/utils/request')
     vi.mocked(api.get).mockImplementation((url: string) => {
       if (url === '/api/v1/users') return Promise.resolve(mockUsers)
+      if (url === '/api/v1/roles') return Promise.resolve(mockRoles)
+      if (url === '/api/v1/route-groups') return Promise.resolve(mockRouteGroups)
       if (url === '/api/v1/logs/operations') {
         return Promise.resolve({
           items: mockLogs,
@@ -293,11 +347,14 @@ describe('OperationLogPage', () => {
     expect(tagTexts).toContain('order.delete')
   })
 
-  it('P5: displays target as type + id', async () => {
+  it('P5: displays target with name for small datasets, #id for large', async () => {
     await mountPage()
     const html = wrapper.html()
+    // user id=5 not in mockUsers, so fallback to #id
     expect(html).toContain('用户 #5')
-    expect(html).toContain('角色 #3')
+    // role id=3 is in mockRoles as 'developer'
+    expect(html).toContain('角色 developer')
+    // order is large dataset, always #id
     expect(html).toContain('订单 #100')
   })
 
@@ -358,6 +415,35 @@ describe('OperationLogPage', () => {
     expect(api.get).toHaveBeenCalled()
   })
 
+  it('P9a: renders operator username instead of #id', async () => {
+    await mountPage()
+    const html = wrapper.html()
+    expect(html).toContain('admin')
+    expect(html).not.toMatch(/#1(?![\d])/)
+  })
+
+  it('P9b: renders role name in target column', async () => {
+    await mountPage()
+    const html = wrapper.html()
+    // mockLogs[1] has target_type='role', target_id=3, which maps to 'developer'
+    expect(html).toContain('角色 developer')
+    expect(html).not.toContain('角色 #3')
+  })
+
+  it('P9c: preserves #id for large dataset targets', async () => {
+    await mountPage()
+    const html = wrapper.html()
+    // mockLogs[2] has target_type='order', target_id=100 — large dataset, keep #id
+    expect(html).toContain('订单 #100')
+  })
+
+  it('P9d: calls all three lookup APIs on mount', async () => {
+    const { api } = await mountPage()
+    expect(api.get).toHaveBeenCalledWith('/api/v1/users', { per_page: 200 })
+    expect(api.get).toHaveBeenCalledWith('/api/v1/roles', { per_page: 200 })
+    expect(api.get).toHaveBeenCalledWith('/api/v1/route-groups', { per_page: 200 })
+  })
+
   it('P9: view button opens drawer and loads detail', async () => {
     const { api } = await mountPage()
 
diff --git a/frontend/src/pages/logs/__tests__/requests.spec.ts b/frontend/src/pages/logs/__tests__/requests.spec.ts
index 94d6dce..5cbe16a 100644
--- a/frontend/src/pages/logs/__tests__/requests.spec.ts
+++ b/frontend/src/pages/logs/__tests__/requests.spec.ts
@@ -214,6 +214,19 @@ describe('useRequestLogStore', () => {
       expect(store.userMap.get(2)).toBe('editor')
     })
 
+    it('S7a: userMap handles string id from API via Number() defense', async () => {
+      const store = useRequestLogStore()
+      // Simulate API returning string-typed ids (the actual bug scenario)
+      store.users = [
+        { id: '1' as any, username: 'admin' },
+        { id: '2' as any, username: 'editor' },
+      ] as any
+
+      // Number() defense in store ensures Map keys are numbers
+      expect(store.userMap.get(1)).toBe('admin')
+      expect(store.userMap.get(2)).toBe('editor')
+    })
+
     it('S7: handles loadLookups failure gracefully', async () => {
       const { api } = await import('@/utils/request')
       vi.mocked(api.get).mockRejectedValueOnce(new Error('加载失败'))
@@ -369,6 +382,25 @@ describe('RequestLogPage', () => {
     expect(api.get).toHaveBeenCalled()
   })
 
+  it('P9a: renders username instead of #id in user column', async () => {
+    await mountPage()
+    const html = wrapper.html()
+    // user_id=1 should render as 'admin', not '#1'
+    expect(html).toContain('admin')
+    expect(html).not.toMatch(/#1(?![\d])/)
+    // user_id=2 should render as 'editor', not '#2'
+    expect(html).toContain('editor')
+  })
+
+  it('P9b: renders dash for null user_id', async () => {
+    await mountPage()
+    // mockLogs[1] has user_id: null, should render '-'
+    // The table should contain '-' for the null user_id row
+    const cells = wrapper.findAll('td')
+    const userCells = cells.filter((c) => c.text() === '-')
+    expect(userCells.length).toBeGreaterThan(0)
+  })
+
   it('P9: view button opens drawer and loads detail', async () => {
     const { api } = await mountPage()
 
diff --git a/frontend/src/pages/logs/operations.vue b/frontend/src/pages/logs/operations.vue
index c6a9cef..52b938e 100644
--- a/frontend/src/pages/logs/operations.vue
+++ b/frontend/src/pages/logs/operations.vue
@@ -63,8 +63,8 @@ const createdAtRange = computed({
   },
 })
 
-onMounted(() => {
-  store.loadLookups()
+onMounted(async () => {
+  await store.loadLookups()
   store.fetchLogs()
 })
 
@@ -89,8 +89,20 @@ function formatTime(time: string | null) {
   return time.replace('T', ' ').substring(0, 16)
 }
 
-function formatTarget(type: string, id: number) {
+function formatTarget(type: string, id: number): string {
   const label = targetTypeLabels[type] || type
+  if (type === 'user') {
+    const name = store.userMap.get(Number(id))
+    return name ? `${label} ${name}` : `${label} #${id}`
+  }
+  if (type === 'role') {
+    const name = store.roleMap.get(Number(id))
+    return name ? `${label} ${name}` : `${label} #${id}`
+  }
+  if (type === 'route_group') {
+    const name = store.routeGroupMap.get(Number(id))
+    return name ? `${label} ${name}` : `${label} #${id}`
+  }
   return `${label} #${id}`
 }
 
@@ -198,7 +210,7 @@ async function handleViewDetail(record: { id: number }) {
           <template v-else-if="column.key === 'user_id'">
             {{
               record.user_id
-                ? (store.userMap.get(record.user_id) || `#${record.user_id}`)
+                ? (store.userMap.get(Number(record.user_id)) || `#${record.user_id}`)
                 : '-'
             }}
           </template>
@@ -255,7 +267,7 @@ async function handleViewDetail(record: { id: number }) {
             <a-descriptions-item label="操作人">
               {{
                 detail.user_id
-                  ? (store.userMap.get(detail.user_id) || `#${detail.user_id}`)
+                  ? (store.userMap.get(Number(detail.user_id)) || `#${detail.user_id}`)
                   : '-'
               }}
             </a-descriptions-item>
diff --git a/frontend/src/pages/logs/requests.vue b/frontend/src/pages/logs/requests.vue
index e3767e7..364c157 100644
--- a/frontend/src/pages/logs/requests.vue
+++ b/frontend/src/pages/logs/requests.vue
@@ -72,8 +72,8 @@ const createdAtRange = computed({
   },
 })
 
-onMounted(() => {
-  store.loadLookups()
+onMounted(async () => {
+  await store.loadLookups()
   store.fetchLogs()
 })
 
@@ -214,7 +214,7 @@ async function handleViewDetail(record: { id: number }) {
             </a-tag>
           </template>
           <template v-else-if="column.key === 'user_id'">
-            {{ record.user_id ? (store.userMap.get(record.user_id) || `#${record.user_id}`) : '-' }}
+            {{ record.user_id ? (store.userMap.get(Number(record.user_id)) || `#${record.user_id}`) : '-' }}
           </template>
           <template v-else-if="column.key === 'duration_ms'">
             <span :class="durationClass(record.duration_ms)">
@@ -274,7 +274,7 @@ async function handleViewDetail(record: { id: number }) {
             <a-descriptions-item label="用户">
               {{
                 detail.user_id
-                  ? (store.userMap.get(detail.user_id) || `#${detail.user_id}`)
+                  ? (store.userMap.get(Number(detail.user_id)) || `#${detail.user_id}`)
                   : '-'
               }}
             </a-descriptions-item>
diff --git a/frontend/src/stores/operation-log.ts b/frontend/src/stores/operation-log.ts
index 8098c89..e5b8c06 100644
--- a/frontend/src/stores/operation-log.ts
+++ b/frontend/src/stores/operation-log.ts
@@ -12,6 +12,16 @@ interface UserLookup {
   username: string
 }
 
+interface RoleLookup {
+  id: number
+  name: string
+}
+
+interface RouteGroupLookup {
+  id: number
+  name: string
+}
+
 export const useOperationLogStore = defineStore('operationLog', () => {
   const logs = ref<OperationLogRecord[]>([])
   const loading = ref(false)
@@ -28,19 +38,28 @@ export const useOperationLogStore = defineStore('operationLog', () => {
   })
 
   const users = ref<UserLookup[]>([])
+  const roles = ref<RoleLookup[]>([])
+  const routeGroups = ref<RouteGroupLookup[]>([])
+
   const userMap = computed(
-    () => new Map(users.value.map((u) => [u.id, u.username])),
+    () => new Map(users.value.map((u) => [Number(u.id), u.username])),
+  )
+  const roleMap = computed(
+    () => new Map(roles.value.map((r) => [Number(r.id), r.name])),
+  )
+  const routeGroupMap = computed(
+    () => new Map(routeGroups.value.map((rg) => [Number(rg.id), rg.name])),
   )
 
   async function loadLookups() {
-    try {
-      const data = await api.get<PaginatedData<UserLookup>>('/api/v1/users', {
-        per_page: 200,
-      })
-      users.value = data.items
-    } catch (err: unknown) {
-      console.warn('加载用户列表失败', err)
-    }
+    const [userData, roleData, rgData] = await Promise.allSettled([
+      api.get<PaginatedData<UserLookup>>('/api/v1/users', { per_page: 200 }),
+      api.get<PaginatedData<RoleLookup>>('/api/v1/roles', { per_page: 200 }),
+      api.get<PaginatedData<RouteGroupLookup>>('/api/v1/route-groups', { per_page: 200 }),
+    ])
+    if (userData.status === 'fulfilled') users.value = userData.value.items
+    if (roleData.status === 'fulfilled') roles.value = roleData.value.items
+    if (rgData.status === 'fulfilled') routeGroups.value = rgData.value.items
   }
 
   async function fetchLogs() {
@@ -86,6 +105,8 @@ export const useOperationLogStore = defineStore('operationLog', () => {
     filters,
     users,
     userMap,
+    roleMap,
+    routeGroupMap,
     loadLookups,
     fetchLogs,
     resetFilters,
diff --git a/frontend/src/stores/request-log.ts b/frontend/src/stores/request-log.ts
index 3a62b2b..e1db2a7 100644
--- a/frontend/src/stores/request-log.ts
+++ b/frontend/src/stores/request-log.ts
@@ -30,7 +30,7 @@ export const useRequestLogStore = defineStore('requestLog', () => {
 
   const users = ref<UserLookup[]>([])
   const userMap = computed(
-    () => new Map(users.value.map((u) => [u.id, u.username])),
+    () => new Map(users.value.map((u) => [Number(u.id), u.username])),
   )
 
   async function loadLookups() {