diff --git a/src/features/studio/robot-author-edit-sheet.tsx b/src/features/studio/robot-author-edit-sheet.tsx
index ed27106..c0ef471 100644
--- a/src/features/studio/robot-author-edit-sheet.tsx
+++ b/src/features/studio/robot-author-edit-sheet.tsx
@@ -2,10 +2,10 @@ import { useEffect } from 'react'
 import { useForm } from 'react-hook-form'
 import { zodResolver } from '@hookform/resolvers/zod'
 import { z } from 'zod'
-import { useMutation, useQueryClient } from '@tanstack/react-query'
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { toast } from 'sonner'
 import type { StudioRobotAuthor } from '@/api/types'
-import { updateRobotAuthor } from '@/api/modules/studio'
+import { fetchSubtopics, updateRobotAuthor } from '@/api/modules/studio'
 import { handleApiError } from '@/lib/errors'
 import { Button } from '@/components/ui/button'
 import { Label } from '@/components/ui/label'
@@ -47,6 +47,7 @@ const jsonObject = z.string().refine(
 const schema = z.object({
   persona: z.string(),
   status: z.enum(STATUSES),
+  subtopic_id: z.string(),
   article_style: jsonObject,
   image_style: jsonObject,
   publishing_rules: jsonObject,
@@ -74,6 +75,7 @@ export function RobotAuthorEditSheet({ author, onOpenChange }: RobotAuthorEditSh
     defaultValues: {
       persona: '',
       status: 'pending',
+      subtopic_id: '',
       article_style: '',
       image_style: '',
       publishing_rules: '',
@@ -85,18 +87,26 @@ export function RobotAuthorEditSheet({ author, onOpenChange }: RobotAuthorEditSh
     form.reset({
       persona: author.persona ?? '',
       status: author.status,
+      subtopic_id: author.subtopic_id ?? '',
       article_style: asText(author.article_style),
       image_style: asText(author.image_style),
       publishing_rules: asText(author.publishing_rules),
     })
   }, [author, form])
 
+  const subtopics = useQuery({
+    queryKey: ['studio-subtopics', 'author-editor', author?.category_id],
+    queryFn: () => fetchSubtopics({ category_id: author!.category_id, status: 'active', page_size: 100 }),
+    enabled: author !== null,
+  })
+
   const mutation = useMutation({
     mutationFn: (values: FormValues) => {
       if (!author) throw new Error('no author')
       return updateRobotAuthor(author.id, {
         persona: values.persona.trim() || null,
         status: values.status,
+        subtopic_id: values.subtopic_id || null,
         article_style: parseObject(values.article_style),
         image_style: parseObject(values.image_style),
         publishing_rules: parseObject(values.publishing_rules),
@@ -142,6 +152,21 @@ export function RobotAuthorEditSheet({ author, onOpenChange }: RobotAuthorEditSh
             </Select>
           </Field>
 
+          <Field label="子话题">
+            <Select
+              value={form.watch('subtopic_id') || '__none'}
+              onValueChange={(value) => form.setValue('subtopic_id', value === '__none' ? '' : value)}
+            >
+              <SelectTrigger><SelectValue placeholder="未分配" /></SelectTrigger>
+              <SelectContent>
+                <SelectItem value="__none">未分配</SelectItem>
+                {subtopics.data?.data.map((subtopic) => (
+                  <SelectItem key={subtopic.id} value={subtopic.id}>{subtopic.title}</SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </Field>
+
           <Field label="人设" error={form.formState.errors.persona?.message}>
             <Textarea rows={3} {...form.register('persona')} placeholder="务实的家电维修师傅…" />
           </Field>