diff --git a/web/src/constants/requirementPhasePrompts.test.ts b/web/src/constants/requirementPhasePrompts.test.ts
index 0ba23ee..c970950 100644
--- a/web/src/constants/requirementPhasePrompts.test.ts
+++ b/web/src/constants/requirementPhasePrompts.test.ts
@@ -3,6 +3,7 @@ import { describe, it, expect } from 'vitest'
 import type { Artifact } from '@/api/projects'
 import {
   buildRequirementSystemPrompt,
+  INTERACTIVE_QUESTION_PROMPT,
   PHASE_ROLE_PROMPTS,
   PREV_ARTIFACT_PHASE,
 } from './requirementPhasePrompts'
@@ -26,6 +27,7 @@ describe('buildRequirementSystemPrompt', () => {
   it('planning：角色模板 + 需求信息，无上一阶段产物', () => {
     const out = buildRequirementSystemPrompt('planning', req)
     expect(out).toContain(PHASE_ROLE_PROMPTS.planning)
+    expect(out).toContain(INTERACTIVE_QUESTION_PROMPT)
     expect(out).toContain('需求 #7：导出报表')
     expect(out).toContain('支持导出 Excel')
     expect(out).not.toContain('上一阶段')
diff --git a/web/src/constants/requirementPhasePrompts.ts b/web/src/constants/requirementPhasePrompts.ts
index b9dde62..9f7d6ee 100644
--- a/web/src/constants/requirementPhasePrompts.ts
+++ b/web/src/constants/requirementPhasePrompts.ts
@@ -14,6 +14,33 @@ export const PHASE_ROLE_PROMPTS: Record<ArtifactPhase, string> = {
 评审维度：完整性（是否覆盖规划目标）、一致性（原型与规划是否矛盾）、可行性（技术与排期风险）、边界情况遗漏、验收标准可测性。明确给出问题清单与修改建议，并给出评审结论（通过 / 有条件通过 / 不通过）。`,
 }
 
+export const INTERACTIVE_QUESTION_PROMPT = [
+  '## 交互式澄清问题协议',
+  '当信息不足且用户直接输入大段文字的成本较高时，优先提出一个结构化澄清问题，方便用户点选。',
+  '每次最多输出 1 个结构化问题；问题必须有 2-5 个选项；只有选项允许多选时 mode 才使用 multiple。',
+  '结构化问题必须放在 acw-question 代码块中，代码块内只能是合法 JSON，不能输出 HTML。',
+  '字段格式如下：',
+  '```acw-question',
+  '{',
+  '  "version": 1,',
+  '  "id": "stable_question_id",',
+  '  "title": "需要用户确认的问题",',
+  '  "description": "选择这个问题的原因，可省略",',
+  '  "mode": "single",',
+  '  "options": [',
+  '    {',
+  '      "id": "stable_option_id",',
+  '      "label": "给用户看的短选项",',
+  '      "summary": "一句话解释，可省略",',
+  '      "details": "更完整的影响说明，可省略"',
+  '    }',
+  '  ],',
+  '  "allowCustom": true',
+  '}',
+  '```',
+  '用户回答结构化问题后，继续基于回答推进本阶段讨论或产物输出。',
+].join('\n')
+
 // 上一阶段产物来源：prototyping ← planning、auditing ← prototyping、planning 无。
 export const PREV_ARTIFACT_PHASE: Record<ArtifactPhase, ArtifactPhase | null> = {
   planning: null,
@@ -28,7 +55,7 @@ export function buildRequirementSystemPrompt(
   requirement: Pick<Requirement, 'number' | 'title' | 'description'>,
   prevArtifact?: Artifact | null,
 ): string {
-  const parts: string[] = [PHASE_ROLE_PROMPTS[phase]]
+  const parts: string[] = [PHASE_ROLE_PROMPTS[phase], INTERACTIVE_QUESTION_PROMPT]
   parts.push(`## 当前需求\n需求 #${requirement.number}：${requirement.title}`)
   if (requirement.description) {
     parts.push(`### 需求描述\n${requirement.description}`)
diff --git a/web/src/utils/interactiveMessage.test.ts b/web/src/utils/interactiveMessage.test.ts
new file mode 100644
index 0000000..303a61b
--- /dev/null
+++ b/web/src/utils/interactiveMessage.test.ts
@@ -0,0 +1,73 @@
+import { describe, expect, it } from 'vitest'
+
+import { formatInteractiveQuestionAnswer, parseInteractiveMessage } from './interactiveMessage'
+
+const questionBlock = `\`\`\`acw-question
+{
+  "version": 1,
+  "id": "target_user",
+  "title": "这个需求主要面向谁？",
+  "description": "选择后我会补全场景。",
+  "mode": "single",
+  "options": [
+    {
+      "id": "admin",
+      "label": "后台管理员",
+      "summary": "负责配置和审核",
+      "details": "更关注权限、批量操作和审计。"
+    },
+    {
+      "id": "user",
+      "label": "普通用户"
+    }
+  ],
+  "allowCustom": true
+}
+\`\`\``
+
+describe('interactiveMessage', () => {
+  it('解析 acw-question 代码块并保留普通 Markdown', () => {
+    const parsed = parseInteractiveMessage(`# 前置说明\n\n${questionBlock}`)
+
+    expect(parsed.markdown).toBe('# 前置说明')
+    expect(parsed.question?.id).toBe('target_user')
+    expect(parsed.question?.options[0]).toMatchObject({
+      id: 'admin',
+      label: '后台管理员',
+      summary: '负责配置和审核',
+    })
+  })
+
+  it('非法 JSON 时回退为普通 Markdown', () => {
+    const content = '```acw-question\n{ broken }\n```'
+    const parsed = parseInteractiveMessage(content)
+
+    expect(parsed.question).toBeNull()
+    expect(parsed.markdown).toBe(content)
+  })
+
+  it('选项数量不合法时回退为普通 Markdown', () => {
+    const content = `\`\`\`acw-question
+{"version":1,"id":"q","title":"Q","mode":"single","options":[{"id":"a","label":"A"}]}
+\`\`\``
+    const parsed = parseInteractiveMessage(content)
+
+    expect(parsed.question).toBeNull()
+    expect(parsed.markdown).toBe(content)
+  })
+
+  it('格式化用户选择为稳定文本', () => {
+    const parsed = parseInteractiveMessage(questionBlock)
+    expect(parsed.question).not.toBeNull()
+
+    const text = formatInteractiveQuestionAnswer({
+      question: parsed.question!,
+      selectedOptionIds: ['admin'],
+      customText: '还需要导出日志',
+    })
+
+    expect(text).toContain('question_id: target_user')
+    expect(text).toContain('- admin: 后台管理员 - 负责配置和审核')
+    expect(text).toContain('还需要导出日志')
+  })
+})
diff --git a/web/src/utils/interactiveMessage.ts b/web/src/utils/interactiveMessage.ts
new file mode 100644
index 0000000..9051d37
--- /dev/null
+++ b/web/src/utils/interactiveMessage.ts
@@ -0,0 +1,161 @@
+const QUESTION_FENCE_RE = /(^|\n)```acw-question[ \t]*\r?\n([\s\S]*?)\r?\n```(?=\n|$)/gi
+
+export type InteractiveQuestionMode = 'single' | 'multiple'
+
+export interface InteractiveQuestionOption {
+  id: string
+  label: string
+  summary?: string
+  details?: string
+}
+
+export interface InteractiveQuestion {
+  version: 1
+  id: string
+  title: string
+  description?: string
+  mode: InteractiveQuestionMode
+  options: InteractiveQuestionOption[]
+  allowCustom: boolean
+}
+
+export interface ParsedInteractiveMessage {
+  markdown: string
+  question: InteractiveQuestion | null
+}
+
+export interface InteractiveQuestionAnswer {
+  question: InteractiveQuestion
+  selectedOptionIds: string[]
+  customText: string
+}
+
+interface FenceMatch {
+  raw: string
+  json: string
+}
+
+export function parseInteractiveMessage(content: string): ParsedInteractiveMessage {
+  const matches = findQuestionFences(content)
+  for (const match of matches) {
+    const question = parseQuestionJSON(match.json)
+    if (!question) continue
+    return {
+      markdown: content.replace(match.raw, '').trim(),
+      question,
+    }
+  }
+  return { markdown: content, question: null }
+}
+
+export function formatInteractiveQuestionAnswer(answer: InteractiveQuestionAnswer): string {
+  const selected = answer.selectedOptionIds
+    .map((id) => answer.question.options.find((option) => option.id === id))
+    .filter((option): option is InteractiveQuestionOption => option != null)
+
+  const selectedLines =
+    selected.length > 0
+      ? selected.map((option) => {
+          const summary = option.summary ? ` - ${option.summary}` : ''
+          return `- ${option.id}: ${option.label}${summary}`
+        })
+      : ['- none']
+
+  const customText = answer.customText.trim() || '无'
+  return [
+    '我选择了结构化问题的答案。',
+    '',
+    `question_id: ${answer.question.id}`,
+    `question: ${answer.question.title}`,
+    'selected_options:',
+    ...selectedLines,
+    '',
+    '补充说明:',
+    customText,
+  ].join('\n')
+}
+
+function findQuestionFences(content: string): FenceMatch[] {
+  const matches: FenceMatch[] = []
+  QUESTION_FENCE_RE.lastIndex = 0
+  let match: RegExpExecArray | null
+  while ((match = QUESTION_FENCE_RE.exec(content)) != null) {
+    matches.push({ raw: match[0], json: match[2] })
+  }
+  return matches
+}
+
+function parseQuestionJSON(json: string): InteractiveQuestion | null {
+  let value: unknown
+  try {
+    value = JSON.parse(json)
+  } catch {
+    return null
+  }
+  return normalizeQuestion(value)
+}
+
+function normalizeQuestion(value: unknown): InteractiveQuestion | null {
+  const record = asRecord(value)
+  if (!record) return null
+  if (record.version !== 1) return null
+
+  const id = requiredString(record.id)
+  const title = requiredString(record.title)
+  const mode = record.mode === 'single' || record.mode === 'multiple' ? record.mode : null
+  if (!id || !title || !mode || !Array.isArray(record.options)) return null
+
+  const options: InteractiveQuestionOption[] = []
+  for (const optionValue of record.options) {
+    const option = normalizeOption(optionValue)
+    if (!option) return null
+    options.push(option)
+  }
+  if (options.length < 2 || options.length > 5) return null
+
+  const optionIds = new Set(options.map((option) => option.id))
+  if (optionIds.size !== options.length) return null
+
+  return {
+    version: 1,
+    id,
+    title,
+    description: optionalString(record.description),
+    mode,
+    options,
+    allowCustom: record.allowCustom === true,
+  }
+}
+
+function normalizeOption(value: unknown): InteractiveQuestionOption | null {
+  const record = asRecord(value)
+  if (!record) return null
+
+  const id = requiredString(record.id)
+  const label = requiredString(record.label)
+  if (!id || !label) return null
+
+  return {
+    id,
+    label,
+    summary: optionalString(record.summary),
+    details: optionalString(record.details),
+  }
+}
+
+function asRecord(value: unknown): Record<string, unknown> | null {
+  if (value == null || typeof value !== 'object' || Array.isArray(value)) return null
+  return value as Record<string, unknown>
+}
+
+function requiredString(value: unknown): string | null {
+  if (typeof value !== 'string') return null
+  const trimmed = value.trim()
+  return trimmed === '' ? null : trimmed
+}
+
+function optionalString(value: unknown): string | undefined {
+  if (typeof value !== 'string') return undefined
+  const trimmed = value.trim()
+  return trimmed === '' ? undefined : trimmed
+}
diff --git a/web/src/views/chat/components/MessageBubble.vue b/web/src/views/chat/components/MessageBubble.vue
index 769c0de..f294561 100644
--- a/web/src/views/chat/components/MessageBubble.vue
+++ b/web/src/views/chat/components/MessageBubble.vue
@@ -25,12 +25,24 @@
       >
         …
       </div>
-      <!-- eslint-disable-next-line vue/no-v-html -->
       <div
         v-else
-        class="prose prose-sm max-w-none"
-        v-html="rendered"
-      />
+        class="space-y-3"
+      >
+        <!-- eslint-disable vue/no-v-html -->
+        <div
+          v-if="hasMarkdown"
+          class="prose prose-sm max-w-none"
+          v-html="rendered"
+        />
+        <!-- eslint-enable vue/no-v-html -->
+        <QuestionCard
+          v-if="parsed.question && message.role === 'assistant'"
+          :question="parsed.question"
+          :disabled="answerDisabled || message.status !== 'ok'"
+          @answer="emit('answer-question', $event)"
+        />
+      </div>
       <div
         v-if="message.status === 'error'"
         class="text-red-500 text-xs mt-1 flex items-center gap-2"
@@ -84,17 +96,26 @@ import { NCollapse, NCollapseItem, NButton } from 'naive-ui'
 import MarkdownIt from 'markdown-it'
 
 import type { ChatMessage } from '@/api/chat'
+import { parseInteractiveMessage, type InteractiveQuestionAnswer } from '@/utils/interactiveMessage'
+import QuestionCard from './QuestionCard.vue'
 
 const md = new MarkdownIt({ html: false, breaks: true, linkify: true })
 // savable：仅需求阶段对话面板传 true，对成功的 assistant 回复显示「保存为产物」。
-const props = defineProps<{ message: ChatMessage; savable?: boolean }>()
-const emit = defineEmits<{ retry: [id: number]; save: [id: number] }>()
-const rendered = computed(() => md.render(props.message.content))
+const props = defineProps<{ message: ChatMessage; savable?: boolean; answerDisabled?: boolean }>()
+const emit = defineEmits<{
+  retry: [id: number]
+  save: [id: number]
+  'answer-question': [payload: InteractiveQuestionAnswer]
+}>()
+const parsed = computed(() => parseInteractiveMessage(props.message.content))
+const hasMarkdown = computed(() => parsed.value.markdown.trim() !== '')
+const rendered = computed(() => md.render(parsed.value.markdown))
 const canSave = computed(
   () =>
     props.savable === true &&
     props.message.role === 'assistant' &&
     props.message.status === 'ok' &&
+    parsed.value.question == null &&
     props.message.content.trim() !== '',
 )
 </script>
diff --git a/web/src/views/chat/components/QuestionCard.test.ts b/web/src/views/chat/components/QuestionCard.test.ts
new file mode 100644
index 0000000..beaf762
--- /dev/null
+++ b/web/src/views/chat/components/QuestionCard.test.ts
@@ -0,0 +1,59 @@
+import { describe, expect, it } from 'vitest'
+import { mount } from '@vue/test-utils'
+
+import QuestionCard from './QuestionCard.vue'
+import type { InteractiveQuestion } from '@/utils/interactiveMessage'
+
+function question(overrides: Partial<InteractiveQuestion> = {}): InteractiveQuestion {
+  return {
+    version: 1,
+    id: 'target_user',
+    title: '这个需求主要面向谁？',
+    description: '选择后我会补全场景。',
+    mode: 'single',
+    options: [
+      { id: 'admin', label: '后台管理员', summary: '负责配置和审核' },
+      { id: 'user', label: '普通用户', details: '直接使用业务功能。' },
+    ],
+    allowCustom: true,
+    ...overrides,
+  }
+}
+
+describe('QuestionCard', () => {
+  it('单选提交选中的答案', async () => {
+    const wrapper = mount(QuestionCard, { props: { question: question() } })
+
+    await wrapper.get('[data-testid="question-option-admin"]').trigger('click')
+    await wrapper.get('[data-testid="question-submit"]').trigger('click')
+
+    expect(wrapper.emitted('answer')?.[0][0]).toMatchObject({
+      question: { id: 'target_user' },
+      selectedOptionIds: ['admin'],
+      customText: '',
+    })
+  })
+
+  it('多选可以提交多个答案', async () => {
+    const wrapper = mount(QuestionCard, {
+      props: { question: question({ mode: 'multiple', allowCustom: false }) },
+    })
+
+    await wrapper.get('[data-testid="question-option-admin"]').trigger('click')
+    await wrapper.get('[data-testid="question-option-user"]').trigger('click')
+    await wrapper.get('[data-testid="question-submit"]').trigger('click')
+
+    expect(wrapper.emitted('answer')?.[0][0]).toMatchObject({
+      selectedOptionIds: ['admin', 'user'],
+    })
+  })
+
+  it('禁用时不能选择或提交', async () => {
+    const wrapper = mount(QuestionCard, { props: { question: question(), disabled: true } })
+
+    await wrapper.get('[data-testid="question-option-admin"]').trigger('click')
+    await wrapper.get('[data-testid="question-submit"]').trigger('click')
+
+    expect(wrapper.emitted('answer')).toBeUndefined()
+  })
+})
diff --git a/web/src/views/chat/components/QuestionCard.vue b/web/src/views/chat/components/QuestionCard.vue
new file mode 100644
index 0000000..1b53196
--- /dev/null
+++ b/web/src/views/chat/components/QuestionCard.vue
@@ -0,0 +1,138 @@
+<template>
+  <div class="rounded-md border border-blue-100 bg-white p-3 space-y-3">
+    <div>
+      <div class="text-sm font-medium text-gray-900">
+        {{ question.title }}
+      </div>
+      <p
+        v-if="question.description"
+        class="mt-1 text-xs text-gray-500 whitespace-pre-wrap"
+      >
+        {{ question.description }}
+      </p>
+    </div>
+
+    <div class="space-y-2">
+      <div
+        v-for="option in question.options"
+        :key="option.id"
+        class="rounded-md border bg-white"
+        :class="isSelected(option.id) ? 'border-blue-400 bg-blue-50' : 'border-gray-200'"
+      >
+        <button
+          type="button"
+          class="w-full text-left p-2 flex items-start gap-2 disabled:cursor-not-allowed"
+          :disabled="disabled"
+          :data-testid="`question-option-${option.id}`"
+          @click="toggleOption(option.id)"
+        >
+          <span
+            class="mt-0.5 flex h-4 w-4 shrink-0 items-center justify-center border text-[10px]"
+            :class="[
+              question.mode === 'single' ? 'rounded-full' : 'rounded',
+              isSelected(option.id)
+                ? 'border-blue-600 bg-blue-600 text-white'
+                : 'border-gray-300 text-transparent',
+            ]"
+          >
+            ✓
+          </span>
+          <span class="min-w-0">
+            <span class="block text-sm font-medium text-gray-900">{{ option.label }}</span>
+            <span
+              v-if="option.summary"
+              class="block text-xs text-gray-500 whitespace-pre-wrap"
+            >
+              {{ option.summary }}
+            </span>
+          </span>
+        </button>
+        <NCollapse
+          v-if="option.details"
+          class="border-t border-gray-100 px-2"
+        >
+          <NCollapseItem
+            title="详情"
+            :name="option.id"
+          >
+            <p class="text-xs text-gray-600 whitespace-pre-wrap pb-2">
+              {{ option.details }}
+            </p>
+          </NCollapseItem>
+        </NCollapse>
+      </div>
+    </div>
+
+    <NInput
+      v-if="question.allowCustom"
+      v-model:value="customText"
+      type="textarea"
+      placeholder="补充说明（可选）"
+      :autosize="{ minRows: 1, maxRows: 3 }"
+      :disabled="disabled"
+    />
+
+    <div class="flex justify-end">
+      <NButton
+        size="small"
+        type="primary"
+        :disabled="!canSubmit"
+        data-testid="question-submit"
+        @click="submit"
+      >
+        提交回答
+      </NButton>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { computed, ref, watch } from 'vue'
+import { NButton, NCollapse, NCollapseItem, NInput } from 'naive-ui'
+
+import type { InteractiveQuestion, InteractiveQuestionAnswer } from '@/utils/interactiveMessage'
+
+const props = defineProps<{ question: InteractiveQuestion; disabled?: boolean }>()
+const emit = defineEmits<{ answer: [payload: InteractiveQuestionAnswer] }>()
+
+const selectedOptionIds = ref<string[]>([])
+const customText = ref('')
+
+const canSubmit = computed(() => {
+  if (props.disabled === true) return false
+  if (selectedOptionIds.value.length > 0) return true
+  return props.question.allowCustom && customText.value.trim() !== ''
+})
+
+watch(
+  () => props.question.id,
+  () => {
+    selectedOptionIds.value = []
+    customText.value = ''
+  },
+)
+
+function isSelected(id: string) {
+  return selectedOptionIds.value.includes(id)
+}
+
+function toggleOption(id: string) {
+  if (props.disabled === true) return
+  if (props.question.mode === 'single') {
+    selectedOptionIds.value = [id]
+    return
+  }
+  selectedOptionIds.value = isSelected(id)
+    ? selectedOptionIds.value.filter((selected) => selected !== id)
+    : [...selectedOptionIds.value, id]
+}
+
+function submit() {
+  if (!canSubmit.value) return
+  emit('answer', {
+    question: props.question,
+    selectedOptionIds: selectedOptionIds.value,
+    customText: customText.value,
+  })
+}
+</script>
diff --git a/web/src/views/projects/components/RequirementChatPanel.vue b/web/src/views/projects/components/RequirementChatPanel.vue
index bfe22a6..8e6bc77 100644
--- a/web/src/views/projects/components/RequirementChatPanel.vue
+++ b/web/src/views/projects/components/RequirementChatPanel.vue
@@ -73,8 +73,10 @@
         :key="m.id"
         :message="m"
         :savable="!readonly"
+        :answer-disabled="readonly || session.isStreaming.value"
         @retry="session.retryMessage"
         @save="onSaveMessage"
+        @answer-question="onAnswerQuestion"
       />
     </div>
     <div
@@ -133,6 +135,10 @@ import { chatApi, type ChatMessage, type Conversation } from '@/api/chat'
 import type { Artifact, ArtifactPhase, Requirement } from '@/api/projects'
 import { useConversationSession } from '@/composables/useConversationSession'
 import { buildRequirementSystemPrompt } from '@/constants/requirementPhasePrompts'
+import {
+  formatInteractiveQuestionAnswer,
+  type InteractiveQuestionAnswer,
+} from '@/utils/interactiveMessage'
 import MessageBubble from '@/views/chat/components/MessageBubble.vue'
 import ModelSelector from '@/views/chat/components/ModelSelector.vue'
 import SaveArtifactModal from './SaveArtifactModal.vue'
@@ -227,6 +233,11 @@ async function send() {
   await session.sendMessage(body)
 }
 
+async function onAnswerQuestion(answer: InteractiveQuestionAnswer) {
+  if (props.readonly || session.isStreaming.value) return
+  await session.sendMessage(formatInteractiveQuestionAnswer(answer))
+}
+
 function onSaveMessage(id: number) {
   const msg = session.messages.value.find((m) => m.id === id)
   if (!msg) return