diff --git a/sundynix-desktop/frontend/src/lib/voice.ts b/sundynix-desktop/frontend/src/lib/voice.ts
index cc4b4df..7508c18 100644
--- a/sundynix-desktop/frontend/src/lib/voice.ts
+++ b/sundynix-desktop/frontend/src/lib/voice.ts
@@ -201,9 +201,16 @@ export class VoiceClient {
     if (!navigator.mediaDevices?.getUserMedia) {
       throw new Error("此窗口暂不支持麦克风（原生壳需授权/安全上下文）。用浏览器打开 localhost:5173 可直接说话。");
     }
-    const stream = await navigator.mediaDevices.getUserMedia({
-      audio: { channelCount: 1, echoCancellation: true, noiseSuppression: true },
-    });
+    // 先试带回声消除等约束（浏览器更好），WKWebView（原生壳）不认高级约束会抛 "Invalid constraint"，
+    // 退回最简 {audio:true}（最兼容；多数实现默认已开回声消除）。
+    let stream: MediaStream;
+    try {
+      stream = await navigator.mediaDevices.getUserMedia({
+        audio: { echoCancellation: true, noiseSuppression: true, channelCount: 1 },
+      });
+    } catch {
+      stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+    }
     this.micStream = stream;
     const ctx = new AudioContext();
     this.micCtx = ctx;