diff --git a/frontend/src/app/workspace/chats/[thread_id]/page.tsx b/frontend/src/app/workspace/chats/[thread_id]/page.tsx
index e7bc36cf..c3d2697c 100644
--- a/frontend/src/app/workspace/chats/[thread_id]/page.tsx
+++ b/frontend/src/app/workspace/chats/[thread_id]/page.tsx
@@ -549,7 +549,7 @@ export default function ChatPage() {
         </DevDialog>
 
         {/* MARK:  开发测试：iframe 通信功能测试面板 */}
-        {/* <IframeTestPanel /> */}
+        <IframeTestPanel />
       </div>
     </ThreadContext.Provider>
   );
diff --git a/frontend/src/components/ai-elements/code-block.tsx b/frontend/src/components/ai-elements/code-block.tsx
index c0460238..0f227cc2 100644
--- a/frontend/src/components/ai-elements/code-block.tsx
+++ b/frontend/src/components/ai-elements/code-block.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import { Button } from "@/components/ui/button";
-import { cn } from "@/lib/utils";
+import { cn, copyToClipboard } from "@/lib/utils";
 import { CheckIcon, CopyIcon } from "lucide-react";
 import {
   type ComponentProps,
@@ -146,14 +146,9 @@ export const CodeBlockCopyButton = ({
   const [isCopied, setIsCopied] = useState(false);
   const { code } = useContext(CodeBlockContext);
 
-  const copyToClipboard = async () => {
-    if (typeof window === "undefined" || !navigator?.clipboard?.writeText) {
-      onError?.(new Error("Clipboard API not available"));
-      return;
-    }
-
+  const handleCopy = async () => {
     try {
-      await navigator.clipboard.writeText(code);
+      await copyToClipboard(code);
       setIsCopied(true);
       onCopy?.();
       setTimeout(() => setIsCopied(false), timeout);
@@ -167,7 +162,7 @@ export const CodeBlockCopyButton = ({
   return (
     <Button
       className={cn("shrink-0", className)}
-      onClick={copyToClipboard}
+      onClick={handleCopy}
       size="icon"
       variant="ghost"
       {...props}
diff --git a/frontend/src/components/ai-elements/message.tsx b/frontend/src/components/ai-elements/message.tsx
index eb18fb5d..9c36a669 100644
--- a/frontend/src/components/ai-elements/message.tsx
+++ b/frontend/src/components/ai-elements/message.tsx
@@ -29,7 +29,7 @@ export const Message = ({ className, from, ...props }: MessageProps) => (
     className={cn(
       "group flex w-full flex-col gap-2 rounded-[10px] p-[20px]",
       from === "user"
-        ? "is-user ml-auto justify-end px-0"
+        ? "is-user ml-auto justify-end px-0 pb-0"
         : "is-assistant bg-[#ffffff]",
       className,
     )}
diff --git a/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx b/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
index 437ee6ac..25be179d 100644
--- a/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
+++ b/frontend/src/components/workspace/artifacts/artifact-file-detail.tsx
@@ -48,7 +48,7 @@ import { installSkill } from "@/core/skills/api";
 import { streamdownPlugins } from "@/core/streamdown";
 import { checkCodeFile, getFileName } from "@/core/utils/files";
 import { env } from "@/env";
-import { cn } from "@/lib/utils";
+import { cn, copyToClipboard } from "@/lib/utils";
 
 import { CitationLink } from "../citations/citation-link";
 import { Tooltip } from "../tooltip";
@@ -240,7 +240,7 @@ export function ArtifactFileDetail({
                 disabled={!content}
                 onClick={async () => {
                   try {
-                    await navigator.clipboard.writeText(displayContent ?? "");
+                    await copyToClipboard(displayContent ?? "");
                     toast.success(t.clipboard.copiedToClipboard);
                   } catch (error) {
                     toast.error("Failed to copy to clipboard");
diff --git a/frontend/src/components/workspace/copy-button.tsx b/frontend/src/components/workspace/copy-button.tsx
index 13d331b5..b279a56b 100644
--- a/frontend/src/components/workspace/copy-button.tsx
+++ b/frontend/src/components/workspace/copy-button.tsx
@@ -3,6 +3,7 @@ import { useCallback, useState, type ComponentProps } from "react";
 
 import { Button } from "@/components/ui/button";
 import { useI18n } from "@/core/i18n/hooks";
+import { copyToClipboard } from "@/lib/utils";
 
 import { Tooltip } from "./tooltip";
 
@@ -15,7 +16,7 @@ export function CopyButton({
   const { t } = useI18n();
   const [copied, setCopied] = useState(false);
   const handleCopy = useCallback(() => {
-    void navigator.clipboard.writeText(clipboardData);
+    void copyToClipboard(clipboardData);
     setCopied(true);
     setTimeout(() => setCopied(false), 2000);
   }, [clipboardData]);
diff --git a/frontend/src/components/workspace/iframe-test-panel.tsx b/frontend/src/components/workspace/iframe-test-panel.tsx
index eca8527c..0967bde9 100644
--- a/frontend/src/components/workspace/iframe-test-panel.tsx
+++ b/frontend/src/components/workspace/iframe-test-panel.tsx
@@ -5,6 +5,7 @@ import { useState } from "react";
 
 import { Button } from "@/components/ui/button";
 import { useIframeSkill } from "@/hooks/use-iframe-skill";
+import { copyToClipboard } from "@/lib/utils";
 import { cn } from "@/lib/utils";
 
 /**
@@ -55,6 +56,15 @@ export function IframeTestPanel() {
     iframeSkill.clearSkill();
     addLog("clearSkill 已调用，postMessage → skill_id=0");
   }
+
+  function handleTestClipboardCopy() {
+    const testText = "测试复制内容 - " + new Date().toISOString();
+    copyToClipboard(testText);
+    addLog(`copyToClipboard → "${testText.slice(0, 30)}..."`);
+  }
+
+  // 检测是否在 iframe 中
+  const isInIframe = typeof window !== "undefined" && window.self !== window.top;
   if (!open) {
     return (
       <button
@@ -204,6 +214,40 @@ export function IframeTestPanel() {
           </div>
         </div>
 
+        {/* 场景 4：剪贴板复制（iframe 通信） */}
+        <div>
+          <div className="mb-1 flex items-center justify-between">
+            <span className="text-xs font-semibold text-gray-500">
+              ④ 剪贴板复制（iframe 通信）
+            </span>
+            <span
+              className={cn(
+                "rounded px-1.5 py-0.5 text-[10px] font-medium",
+                isInIframe
+                  ? "bg-violet-100 text-violet-700"
+                  : "bg-gray-100 text-gray-500",
+              )}
+            >
+              {isInIframe ? "iframe 模式" : "独立页面"}
+            </span>
+          </div>
+          <div className="flex flex-col gap-2">
+            <Button
+              size="sm"
+              className="w-full bg-blue-50 text-xs text-blue-700 hover:bg-blue-100"
+              variant="ghost"
+              onClick={handleTestClipboardCopy}
+            >
+              📋 测试复制到剪贴板
+            </Button>
+            <div className="rounded bg-gray-100 px-2 py-1.5 text-[10px] text-gray-600">
+              {isInIframe
+                ? "将通过 postMessage 请求父页面复制"
+                : "将直接调用 navigator.clipboard"}
+            </div>
+          </div>
+        </div>
+
         {/* 日志 */}
         {log.length > 0 && (
           <div className="rounded-lg bg-gray-900 p-2">
diff --git a/frontend/src/components/workspace/recent-chat-list.tsx b/frontend/src/components/workspace/recent-chat-list.tsx
index 220aee22..546b1f46 100644
--- a/frontend/src/components/workspace/recent-chat-list.tsx
+++ b/frontend/src/components/workspace/recent-chat-list.tsx
@@ -39,6 +39,7 @@ import {
 } from "@/core/threads/hooks";
 import { pathOfThread, titleOfThread } from "@/core/threads/utils";
 import { env } from "@/env";
+import { copyToClipboard } from "@/lib/utils";
 
 export function RecentChatList() {
   const { t } = useI18n();
@@ -102,7 +103,7 @@ export function RecentChatList() {
       const baseUrl = isLocalhost ? VERCEL_URL : window.location.origin;
       const shareUrl = `${baseUrl}/workspace/chats/${threadId}`;
       try {
-        await navigator.clipboard.writeText(shareUrl);
+        await copyToClipboard(shareUrl);
         toast.success(t.clipboard.linkCopied);
       } catch {
         toast.error(t.clipboard.failedToCopyToClipboard);
diff --git a/frontend/src/lib/utils.ts b/frontend/src/lib/utils.ts
index f8ff63a2..991b94bf 100644
--- a/frontend/src/lib/utils.ts
+++ b/frontend/src/lib/utils.ts
@@ -10,3 +10,26 @@ export const externalLinkClass =
   "text-primary underline underline-offset-2 hover:no-underline";
 /** Link style without underline by default (e.g. for streaming/loading). */
 export const externalLinkClassNoUnderline = "text-primary hover:underline";
+
+/**
+ * Copy text to clipboard, using postMessage when in iframe.
+ * In iframe context, sends message to parent window to handle clipboard operation.
+ */
+export async function copyToClipboard(text: string): Promise<void> {
+  const isInIframe = window.self !== window.top;
+  const message = {
+    type: "copyToClipboard",
+    data: text,
+  };
+
+  if (isInIframe && window.parent) {
+    // Request parent window to copy
+    window.parent.postMessage(message, "*");
+    console.log("[copyToClipboard] iframe mode → postMessage to parent", message);
+    return;
+  }
+
+  // Direct clipboard access when not in iframe
+  console.log("[copyToClipboard] direct mode", message);
+  await navigator.clipboard.writeText(text);
+}