diff --git a/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx b/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx
index 2b7181b8..dee1b995 100644
--- a/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx
+++ b/frontend-web/src/roundtable-planning/pages/RoundtablePlanningPage.tsx
@@ -436,7 +436,6 @@ export default function RoundtablePlanningPage() {
   const [step2RoundtableDialogues, setStep2RoundtableDialogues] = useState<any[]>([]);
 
   // Inputs for Step 2 conversation simulation controls
-  const [roundTableSpeed, setRoundTableSpeed] = useState<string>("正常");
   const [isRoundTableRunning, setIsRoundTableRunning] = useState<boolean>(true);
   const [customAgentInput, setCustomAgentInput] = useState<string>("");
   // Whether the roundtable visualizer + constraint console panel is collapsed.
@@ -465,6 +464,7 @@ export default function RoundtablePlanningPage() {
   // early-returned because the ref was already set; net result: the async
   // landed but its setState got skipped, leaving intentThreadId null forever).
   const step1InitGenRef = useRef<number>(0);
+  const intentAborterRef = useRef<AbortController | null>(null);
 
   // Multi-agent orchestration state (lives only for one step-2 visit).
   const [threadIds, setThreadIds] = useState<ThreadIdMap | null>(null);
@@ -516,6 +516,17 @@ export default function RoundtablePlanningPage() {
     activeAbortersRef.current.clear();
   }, []);
 
+  const stopIntentStream = useCallback(() => {
+    if (intentAborterRef.current) {
+      try {
+        intentAborterRef.current.abort();
+      } catch {
+        /* noop */
+      }
+      intentAborterRef.current = null;
+    }
+  }, []);
+
   // Toast auto-dismiss logic
   useEffect(() => {
     if (showToast) {
@@ -524,6 +535,11 @@ export default function RoundtablePlanningPage() {
     }
   }, [showToast]);
 
+  useEffect(() => {
+    if (currentStep === 1) return;
+    stopIntentStream();
+  }, [currentStep, stopIntentStream]);
+
   // Auto-follow the streamed conversations: track scroll position, stop
   // following when the user scrolls up, expose a `回到底部` button that
   // re-engages auto-follow. Same hook for both steps.
@@ -1172,6 +1188,7 @@ export default function RoundtablePlanningPage() {
     // Stop anything in flight before swapping state out.
     orchestrationCancelRef.current = true;
     abortAllInFlight();
+    stopIntentStream();
     setIsOrchestrating(false);
     setIsInitializing(false);
     setPendingClarification(null);
@@ -1201,7 +1218,7 @@ export default function RoundtablePlanningPage() {
     // doesn't change and the effect wouldn't re-fire.
     runStep1Init();
     triggerToast("✨ 已开始新任务,请在第一步与任务理解智能体澄清需求");
-  }, [abortAllInFlight, runStep1Init]);
+  }, [abortAllInFlight, runStep1Init, stopIntentStream]);
 
   // ── Draft helpers ──────────────────────────────────────────────────────
   // Build a fresh snapshot of the current in-memory session. Called by every
@@ -1307,6 +1324,7 @@ export default function RoundtablePlanningPage() {
       // Cancel anything in-flight before swapping state out from under it.
       orchestrationCancelRef.current = true;
       abortAllInFlight();
+      stopIntentStream();
       setIsOrchestrating(false);
       setIsInitializing(false);
       setPendingClarification(null);
@@ -1347,7 +1365,7 @@ export default function RoundtablePlanningPage() {
       setCurrentStep(draft.furthestStep);
       triggerToast(`📂 已加载草稿:${draft.name}`);
     },
-    [drafts, abortAllInFlight],
+    [drafts, abortAllInFlight, stopIntentStream],
   );
 
   const handleDeleteDraft = useCallback(
@@ -1470,11 +1488,14 @@ export default function RoundtablePlanningPage() {
     };
 
     setIsIntentSending(true);
+    const aborter = new AbortController();
+    intentAborterRef.current = aborter;
     try {
       const res = await streamIntent({
         threadId: intentThreadId,
         message: trimmed,
         model: DEFAULT_MODEL,
+        signal: aborter.signal,
         onTextDelta: (delta) => {
           setInteractiveMessages(prev =>
             prev.map(m => (m.id === agentMsgId ? { ...m, content: (m.content ?? "") + delta } : m)),
@@ -1529,16 +1550,36 @@ export default function RoundtablePlanningPage() {
         triggerToast(`❌ 智能体调用失败: ${res.content}`);
       }
     } catch (err) {
-      console.error("intent stream failed:", err);
-      setInteractiveMessages(prev =>
-        prev.map(m =>
-          m.id === agentMsgId
-            ? { ...m, content: `(错误) ${(err as Error).message}`, streaming: false } as any
-            : m,
-        ),
-      );
-      triggerToast(`❌ 发送失败: ${(err as Error).message}`);
+      if ((err as Error).name === "AbortError" || aborter.signal.aborted) {
+        setInteractiveMessages(prev =>
+          prev.map(m =>
+            m.id === agentMsgId
+              ? {
+                  ...m,
+                  content: (m.content ?? "").trim()
+                    ? `${m.content ?? ""}\n\n(已暂停)`
+                    : "(已暂停)",
+                  streaming: false,
+                } as any
+              : m,
+          ),
+        );
+        triggerToast("⏸️ 已暂停任务理解回复");
+      } else {
+        console.error("intent stream failed:", err);
+        setInteractiveMessages(prev =>
+          prev.map(m =>
+            m.id === agentMsgId
+              ? { ...m, content: `(错误) ${(err as Error).message}`, streaming: false } as any
+              : m,
+          ),
+        );
+        triggerToast(`❌ 发送失败: ${(err as Error).message}`);
+      }
     } finally {
+      if (intentAborterRef.current === aborter) {
+        intentAborterRef.current = null;
+      }
       setIsIntentSending(false);
     }
   };
@@ -2603,6 +2644,18 @@ export default function RoundtablePlanningPage() {
                       {isIntentSending ? "发送中" : "发送"}
                     </button>
 
+                    {isIntentSending && (
+                      <button
+                        id="pause-intent-btn"
+                        type="button"
+                        onClick={() => stopIntentStream()}
+                        className="bg-amber-100 hover:bg-amber-200 text-amber-800 text-xs font-bold px-3 py-2.5 rounded-xl flex items-center gap-1.5 transition border border-amber-200/40 shadow-sm active:scale-95"
+                      >
+                        <Pause className="w-3 h-3" />
+                        暂停
+                      </button>
+                    )}
+
                     <button 
                       id="suggest-followup-btn"
                       onClick={handleAgentFollowUp}
@@ -2676,23 +2729,6 @@ export default function RoundtablePlanningPage() {
                   </div>
                 </div>
                 <div className="flex items-center gap-2.5">
-                  {/* Interactive speed controls */}
-                  <div className="flex items-center bg-slate-50 border border-slate-200 rounded-xl p-0.5 text-[10px] shrink-0 font-bold font-sans shadow-inner">
-                    <span className="px-2 text-slate-400 font-semibold selection:bg-transparent">研商步长</span>
-                    <button 
-                      onClick={() => { setRoundTableSpeed("慢速"); triggerToast("🐌 已切换为 0.5x 慢速拟合监听模式"); }}
-                      className={`px-1.5 py-0.5 rounded transition ${roundTableSpeed === "慢速" ? "bg-white text-primary font-extrabold shadow-sm" : "text-slate-500 hover:text-slate-800"}`}
-                    >慢速</button>
-                    <button 
-                      onClick={() => { setRoundTableSpeed("正常"); triggerToast("⏱️ 已恢复为 1.0x 标准协商状态值"); }}
-                      className={`px-1.5 py-0.5 rounded transition ${roundTableSpeed === "正常" ? "bg-white text-primary font-extrabold shadow-sm" : "text-slate-500 hover:text-slate-800"}`}
-                    >正常</button>
-                    <button 
-                      onClick={() => { setRoundTableSpeed("极速"); triggerToast("🚀 已并行为 2.5x 极速算力重算模式"); }}
-                      className={`px-1.5 py-0.5 rounded transition ${roundTableSpeed === "极速" ? "bg-white text-primary font-extrabold shadow-sm" : "text-slate-500 hover:text-slate-800"}`}
-                    >极速</button>
-                  </div>
-                  
                   {/* Suspend / resume button visibility:
                       - Show "挂起协商" only while a run is actually in flight
                         (isOrchestrating + still nominally running). When the