diff --git a/frontend/src/sdk-test/SdkTestPanel.vue b/frontend/src/sdk-test/SdkTestPanel.vue
index 24f62c2..0b12b6d 100644
--- a/frontend/src/sdk-test/SdkTestPanel.vue
+++ b/frontend/src/sdk-test/SdkTestPanel.vue
@@ -288,6 +288,7 @@ import '@tdesign-vue-next/chat/es/style/index.css'
 import { MessagePlugin } from 'tdesign-vue-next'
 import { readSSEStream } from '@/utils/sse'
 import { renderMarkdown } from '@/utils/markdown'
+import { toast } from '@/utils/toast'
 import { toChatData, type ChatMessage } from '@/utils/chatAdapter'
 
 // ==================== 常量 ====================
@@ -673,17 +674,21 @@ async function sendDemo(val?: string): Promise<void> {
   demoMessages.value.push({ id: genId(), role: 'user', content: text, streaming: false, time: fmtTime() })
   const assistantMsg: ChatMessage = { id: genId(), role: 'assistant', content: '', streaming: true, time: fmtTime(), sources: [] }
   demoMessages.value.push(assistantMsg)
-  await scrollDemoBottom()
 
+  const cid = demoChatId.value
+  const requestMode = demoMode.value
   const opts = { enableRag: demoRag.value, rewriteStrategy: demoRag.value ? demoStrategy.value : undefined }
-  const url = buildDemoUrl(demoMode.value === 'sync' ? 'chat' : 'chat/stream', text, demoChatId.value, opts)
+  // 提前构建 URL，固定本轮角色、账号、域名和检索配置。
+  const url = buildDemoUrl(requestMode === 'sync' ? 'chat' : 'chat/stream', text, cid, opts)
+  const sourcesUrl = opts.enableRag ? buildDemoUrl('chat/sources', text, cid, opts) : ''
   const headers = sdkAuthHeaders()
+  await scrollDemoBottom()
 
   try {
     if (abortController) abortController.abort()
     abortController = new AbortController()
 
-    if (demoMode.value === 'sync') {
+    if (requestMode === 'sync') {
       const res = await fetch(url, { headers, signal: abortController.signal })
       if (!res.ok) throw new Error('HTTP ' + res.status)
       assistantMsg.content = await res.text()
@@ -701,15 +706,19 @@ async function sendDemo(val?: string): Promise<void> {
       )
     }
 
-    // RAG 模式下拉取引用来源
-    if (demoRag.value) {
-      try {
-        const sres = await fetch(buildDemoUrl('chat/sources', text, demoChatId.value, opts), { headers })
+    // 引用来源后台补齐，正文完成后立即结束发送状态。
+    if (opts.enableRag) {
+      void fetch(sourcesUrl, { headers }).then(async sres => {
         const json = await sres.json()
-        if (json && json.success) assistantMsg.sources = json.data || []
-      } catch {
-        /* 来源获取失败不影响主回答 */
-      }
+        if (!sres.ok || !json?.success) {
+          throw new Error(json?.message || (sres.ok ? '引用来源获取失败' : 'HTTP ' + sres.status))
+        }
+        if (demoChatId.value !== cid || !demoMessages.value.some(msg => msg.id === assistantMsg.id)) return
+        assistantMsg.sources = json.data || []
+        demoMessages.value = [...demoMessages.value]
+      }).catch((e: any) => {
+        toast('引用来源获取失败: ' + (e.message || e), 'warning')
+      })
     }
   } catch (e: any) {
     if (e.name === 'AbortError') {
diff --git a/frontend/src/views/ChatPanel.vue b/frontend/src/views/ChatPanel.vue
index 63dd2ba..c61c80c 100644
--- a/frontend/src/views/ChatPanel.vue
+++ b/frontend/src/views/ChatPanel.vue
@@ -491,6 +491,19 @@ async function send(): Promise<void> {
   isSending.value = true
   currentSuggestions.value = []  // 清空建议
 
+  const cid = chatId.value || ('web_' + Date.now())
+  chatId.value = cid
+  const requestMode = mode.value
+  // 固定本轮参数，后台引用请求不读取后续切换的角色或 RAG 配置。
+  const imageUrls = attachments.filter(a => a.type === 'image').map(a => a.url)
+  const chatOptions: ChatOptions = {
+    roleId: currentRoleId(),
+    enableRag: isRagMode.value,
+    rewriteStrategy: isRagMode.value ? ragStrategy.value : undefined,
+    categoryIds: [...selectedCategoryIds.value],
+    imageUrls: imageUrls.length ? imageUrls : undefined,
+  }
+
   // 追加用户消息（含附件）
   messages.value.push({
     id: generateMsgId(), role: 'user', content: text,
@@ -505,32 +518,19 @@ async function send(): Promise<void> {
   messages.value.push(assistantMsg)
   await scrollToBottom()
 
-  const cid = chatId.value || ('web_' + Date.now())
-  chatId.value = cid
-
   try {
     // 取消上一个 SSE 请求并创建新的 AbortController
     if (sseAbortController) { sseAbortController.abort() }
     sseAbortController = new AbortController()
     const signal = sseAbortController.signal
 
-    // 统一对话请求参数（RAG 与普通对话共用同一接口，由 enableRag 参数区分）
-    const imageUrls = attachments.filter(a => a.type === 'image').map(a => a.url)
-    const chatOptions: ChatOptions = {
-      roleId: currentRoleId(),
-      enableRag: isRagMode.value,
-      rewriteStrategy: isRagMode.value ? ragStrategy.value : undefined,
-      categoryIds: selectedCategoryIds.value,
-      imageUrls: imageUrls.length ? imageUrls : undefined,
-    }
-
-    if (mode.value === 'sync') {
+    if (requestMode === 'sync') {
       // 同步调用
       assistantMsg.content = await chatSync(text, cid, chatOptions)
     } else {
       // SSE 流式
       const url = chatSSEUrl(text, cid, chatOptions)
-      if (isRagMode.value) {
+      if (chatOptions.enableRag) {
         await readSSEStreamWithEvents(url, {
           onMessage: async (chunk: string) => {
             assistantMsg.content += chunk
@@ -562,12 +562,16 @@ async function send(): Promise<void> {
       }
     }
 
-    // RAG 模式下，拉取引用来源
-    if (isRagMode.value) {
-      try {
-        const sj = await ragSources(text, cid, chatOptions)
-        if (sj && sj.success) assistantMsg.sources = sj.data || []
-      } catch (_) { /* 来源获取失败不影响主回答 */ }
+    // 引用来源后台补齐，正文完成后立即结束发送状态。
+    if (chatOptions.enableRag) {
+      void ragSources(text, cid, chatOptions).then(sj => {
+        if (!sj?.success) throw new Error(sj?.message || '引用来源获取失败')
+        if (chatId.value !== cid || !messages.value.some(msg => msg.id === assistantMsg.id)) return
+        assistantMsg.sources = sj.data || []
+        messages.value = [...messages.value]
+      }).catch((e: any) => {
+        toast('引用来源获取失败: ' + (e.message || e), 'warning')
+      })
     }
   } catch (e: any) {
     // AbortError 不是真正的错误，不显示错误信息