diff --git a/src/renderer/src/components/ChatPanel.vue b/src/renderer/src/components/ChatPanel.vue
index aa22d5d..30676b9 100644
--- a/src/renderer/src/components/ChatPanel.vue
+++ b/src/renderer/src/components/ChatPanel.vue
@@ -246,6 +246,11 @@ async function sendQuery(): Promise<void> {
 async function sendVisionQuery(): Promise<void> {
   if (!pendingImage.value) return
   if (store.querying) return
+  // 防守拍完照到点发送之间后端被切成纯文本模型的空窗（按钮此时已置灰，但图片还留在输入区）
+  if (!store.visionAvailable) {
+    message.warning('当前生成服务加载的不是多模态模型，无法识别图片')
+    return
+  }
 
   const q = question.value.trim()
   const img = pendingImage.value
@@ -670,9 +675,14 @@ onUnmounted(() => {
             语音输出
           </button>
         </div>
-        <!-- Camera button -->
+        <!-- Camera button：显示与否看用户开关，能否点击看后端当前模型是否支持图像输入 -->
         <div v-if="store.config?.vision.enabled" class="voice-btn-wrap">
-          <button class="voice-btn" @click="cameraOpen = true">
+          <button
+            class="voice-btn"
+            :disabled="!store.visionAvailable"
+            :title="store.visionAvailable ? '拍照提问' : '当前生成服务加载的不是多模态模型，无法识别图片'"
+            @click="cameraOpen = true"
+          >
             <svg width="26" height="26" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round">
               <path d="M23 19a2 2 0 0 1-2 2H3a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h4l2-3h6l2 3h4a2 2 0 0 1 2 2z"/>
               <circle cx="12" cy="13" r="4"/>
@@ -951,14 +961,20 @@ onUnmounted(() => {
   font-family: inherit;
   transition: all .15s;
 }
-.voice-btn:hover { background: var(--panel-3); }
+.voice-btn:not(:disabled):hover { background: var(--panel-3); }
 .voice-btn.on {
   background: var(--green);
   border-color: var(--green);
   color: #fff;
   box-shadow: 0 2px 0 #0a6238;
 }
-.voice-btn:disabled { opacity: .6; cursor: default; }
+.voice-btn:disabled {
+  opacity: .5;
+  cursor: not-allowed;
+  background: var(--panel-3);
+  border-color: var(--line);
+  color: var(--ink-3);
+}
 .voice-spinner {
   width: 22px;
   height: 22px;
diff --git a/src/renderer/src/components/ServiceControl.vue b/src/renderer/src/components/ServiceControl.vue
index df6acac..e7dbc36 100644
--- a/src/renderer/src/components/ServiceControl.vue
+++ b/src/renderer/src/components/ServiceControl.vue
@@ -30,21 +30,41 @@ let pollTimer: ReturnType<typeof setInterval> | null = null
 let genSse: EventSource | null = null
 let embSse: EventSource | null = null
 
+/**
+ * 判断生成服务当前加载的模型能不能吃图片输入。
+ *
+ * 首选依据是模型加载后打印的 `allow_image = 1`，但 er_backend 的日志缓冲只留最近 200 条，
+ * 服务跑一会儿这行就会被推理日志挤掉（实测确认），所以只在还能翻到时采信；翻不到时退回
+ * 看启动命令里有没有 `--mmproj`——这个字段不随日志滚动，是长期可靠的依据。
+ */
+function detectVisionCapability(gen: {
+  status?: string
+  lastCommand?: string
+  logs?: Array<{ text?: string }>
+}): boolean {
+  if (gen?.status !== 'running') return false
+  const logHit = gen.logs?.find((l) => l.text?.includes('allow_image'))
+  if (logHit?.text) return /allow_image\s*=\s*1/.test(logHit.text)
+  return !!gen.lastCommand?.includes('--mmproj')
+}
+
 async function pollStatus() {
   if (!needsService.value) return
   try {
     const res = await fetch(`${ER_BACKEND}/api/status`, { signal: AbortSignal.timeout(2000) })
-    if (!res.ok) { erUp.value = false; return }
+    if (!res.ok) { erUp.value = false; store.visionAvailable = false; return }
     const data = await res.json()
     erUp.value = true
     erGenStatus.value   = data.generate?.status || 'stopped'
     erEmbedStatus.value = data.embed?.status    || 'stopped'
     store.serverState      = { status: erGenStatus.value,   logs: store.serverState.logs }
     store.embedServerState = { status: erEmbedStatus.value, logs: store.embedServerState.logs }
+    store.visionAvailable  = detectVisionCapability(data.generate ?? {})
   } catch {
     erUp.value = false
     erGenStatus.value   = 'stopped'
     erEmbedStatus.value = 'stopped'
+    store.visionAvailable = false
   }
 }
 
diff --git a/src/renderer/src/stores/rag.ts b/src/renderer/src/stores/rag.ts
index a813421..07d597a 100644
--- a/src/renderer/src/stores/rag.ts
+++ b/src/renderer/src/stores/rag.ts
@@ -33,6 +33,11 @@ export const useRagStore = defineStore('rag', () => {
   // 启动时硬件探测结果（null=尚未完成探测）
   const detectedCard = ref<DetectedCard | null>(null)
 
+  // 生成服务当前加载的模型是否支持图像输入（由 ServiceControl 的状态轮询写入）。
+  // 拍照提问要靠它决定按钮能不能点——后端换成纯文本模型时按钮置灰，
+  // 换回多模态模型后无需重启应用，下一轮轮询就会自动恢复可用。
+  const visionAvailable = ref(false)
+
   // think 标签由 ChatPanel 负责渲染，此处直接透传
   const displayAnswer = computed(() => rawAnswer.value)
 
@@ -83,6 +88,7 @@ export const useRagStore = defineStore('rag', () => {
     embedServerLogs,
     npuStats,
     detectedCard,
+    visionAvailable,
     refreshDbStatus,
     loadConfig,
     saveConfig,