diff --git a/apps/miniprogram/src/pages/messages/index.tsx b/apps/miniprogram/src/pages/messages/index.tsx
index d1e596e..2fc8ad9 100644
--- a/apps/miniprogram/src/pages/messages/index.tsx
+++ b/apps/miniprogram/src/pages/messages/index.tsx
@@ -26,6 +26,7 @@ function genId(): string {
 
 export default function Messages() {
   const user = useAuthStore((s) => s.user);
+  const currentPatient = useAuthStore((s) => s.currentPatient);
   const modeClass = useElderClass();
   const [messages, setMessages] = useState<AiChatMessage[]>([]);
   const [inputText, setInputText] = useState('');
@@ -70,7 +71,7 @@ export default function Messages() {
     scrollToBottom(next);
 
     try {
-      const resp = await sendAiMessage(content, next);
+      const resp = await sendAiMessage(content, next, currentPatient?.id);
       const aiMsg: AiChatMessage = {
         id: resp.message_id || genId(),
         role: 'assistant',
diff --git a/apps/miniprogram/src/services/ai-chat.ts b/apps/miniprogram/src/services/ai-chat.ts
index c516364..44a88f9 100644
--- a/apps/miniprogram/src/services/ai-chat.ts
+++ b/apps/miniprogram/src/services/ai-chat.ts
@@ -16,11 +16,16 @@ export interface AiChatResponse {
 export async function sendAiMessage(
   message: string,
   history?: AiChatMessage[],
+  patientId?: string,
 ): Promise<AiChatResponse> {
-  const resp = await api.post<AiChatResponse>('/ai/chat', {
+  const body: Record<string, unknown> = {
     message,
     history: history?.slice(-10),
-  });
+  };
+  if (patientId) {
+    body.patient_id = patientId;
+  }
+  const resp = await api.post<AiChatResponse>('/ai/chat', body);
   return resp;
 }