diff --git a/frontend/app/components/assistant-ui/thread.tsx b/frontend/app/components/assistant-ui/thread.tsx
index a26fe77..9cdeeb4 100644
--- a/frontend/app/components/assistant-ui/thread.tsx
+++ b/frontend/app/components/assistant-ui/thread.tsx
@@ -58,6 +58,7 @@ import {
 import { MarkdownText } from "@/components/assistant-ui/markdown-text";
 import { Reasoning } from "@/components/assistant-ui/reasoning";
 import {
+	type ClawRunStatus,
 	fetchLatestRunStatus,
 	toReplayRepository,
 } from "@/components/assistant-ui/thread-list";
@@ -925,6 +926,8 @@ const ComposerAction: FC = () => {
 	});
 	const [runtimeCancelling, setRuntimeCancelling] = useState(false);
 	const cancelSessionId = replayedRun.sessionId ?? currentSessionId;
+	const backendRunStatus = useBackendActiveRunStatus(cancelSessionId);
+	const cancelRunId = replayedRun.runId ?? backendRunStatus?.run_id ?? null;
 	useEffect(() => {
 		if (!runtimeRunning) setRuntimeCancelling(false);
 	}, [runtimeRunning]);
@@ -935,7 +938,7 @@ const ComposerAction: FC = () => {
 				<ComposerAssistButtons />
 			</div>
 			<ComposerContextStatus />
-			{!runtimeRunning && !replayedRun.active ? (
+			{!runtimeRunning && !replayedRun.active && !backendRunStatus ? (
 				<ComposerPrimitive.Send asChild>
 					<TooltipIconButton
 						tooltip="Send message"
@@ -961,11 +964,12 @@ const ComposerAction: FC = () => {
 					onClick={() => {
 						if (!cancelSessionId) return;
 						setRuntimeCancelling(true);
-						void cancelLatestRun(cancelSessionId, replayedRun.runId)
+						void cancelLatestRun(cancelSessionId, cancelRunId)
 							.catch(() => undefined)
 							.finally(() => {
 								// 后端可能已经 idle；无论取消接口是否真的命中 run，都清理本地残留运行态。
 								aui.thread().cancelRun();
+								window.dispatchEvent(new Event("claw-sessions-changed"));
 								window.setTimeout(() => setRuntimeCancelling(false), 1200);
 							});
 					}}
@@ -973,16 +977,48 @@ const ComposerAction: FC = () => {
 					<SquareIcon className="aui-composer-cancel-icon size-3 fill-current" />
 				</Button>
 			) : null}
-			{!runtimeRunning && replayedRun.active ? (
+			{!runtimeRunning && (replayedRun.active || backendRunStatus) ? (
 				<ReplayedRunCancelButton
-					sessionId={replayedRun.sessionId}
-					runId={replayedRun.runId}
+					sessionId={cancelSessionId}
+					runId={cancelRunId}
 				/>
 			) : null}
 		</div>
 	);
 };
 
+function useBackendActiveRunStatus(sessionId: string | null) {
+	const [status, setStatus] = useState<ClawRunStatus | null>(null);
+
+	useEffect(() => {
+		if (!sessionId) {
+			setStatus(null);
+			return;
+		}
+		const safeSessionId = sessionId;
+		let cancelled = false;
+
+		async function refresh() {
+			const nextStatus = await fetchLatestRunStatus(safeSessionId);
+			if (cancelled) return;
+			setStatus(isActiveRunStatus(nextStatus) ? nextStatus : null);
+		}
+
+		void refresh();
+		const interval = window.setInterval(refresh, 1000);
+		return () => {
+			cancelled = true;
+			window.clearInterval(interval);
+		};
+	}, [sessionId]);
+
+	return status;
+}
+
+function isActiveRunStatus(status?: ClawRunStatus | null) {
+	return status?.status === "queued" || status?.status === "running";
+}
+
 const ReplayedRunCancelButton: FC<{
 	sessionId: string | null;
 	runId: string | null;