diff --git a/src/components/ChatView.tsx b/src/components/ChatView.tsx
index 06fba9e..dc72ee9 100644
--- a/src/components/ChatView.tsx
+++ b/src/components/ChatView.tsx
@@ -4,6 +4,7 @@ import { INSUFFICIENT_BALANCE_NOTICE } from '../hooks/useTKMindChat';
 import type { CapabilityMap, PortalUser, SessionSummary } from '../types';
 import { useNetworkStatus } from '../hooks/useNetworkStatus';
 import { getSessionDisplayName } from '../utils/sessions';
+import { isH5OrWechatClient } from '../utils/wechat';
 import { BalanceRing } from './BalanceRing';
 import { HistorySidebar } from './HistorySidebar';
 import { TKMindAvatar } from './TKMindAvatar';
@@ -24,6 +25,7 @@ function RecentSessionRail({
   loadingMore,
   hasMore,
   chipWidth,
+  variant = 'inline',
   onSelect,
   onLoadMore,
 }: {
@@ -34,6 +36,7 @@ function RecentSessionRail({
   loadingMore: boolean;
   hasMore: boolean;
   chipWidth?: number | null;
+  variant?: 'inline' | 'floating';
   onSelect: (session: SessionSummary) => void;
   onLoadMore: () => void;
 }) {
@@ -91,12 +94,14 @@ function RecentSessionRail({
 
   if (!loading && recentSessions.length === 0) return null;
 
+  const isFloating = variant === 'floating';
+
   return (
     <div
-      className="header-session-rail"
+      className={`header-session-rail${isFloating ? ' header-session-rail-floating' : ''}`}
       aria-label="最近对话入口"
       style={
-        chipWidth && chipWidth > 0
+        !isFloating && chipWidth && chipWidth > 0
           ? ({ ['--header-session-chip-width' as string]: `${chipWidth}px` })
           : undefined
       }
@@ -285,11 +290,6 @@ export function ChatView({
       : pendingSessionTitle;
 
   const moreMenuItems = [
-    {
-      id: 'new-session',
-      label: '新会话',
-      onClick: () => void handleNewSession(),
-    },
     ...(onOpenAdmin
       ? [{ id: 'admin', label: '管理', onClick: () => onOpenAdmin() }]
       : []),
@@ -298,8 +298,21 @@ export function ChatView({
       : []),
   ];
 
+  const useFloatingSessionRail = useMemo(() => isH5OrWechatClient(), []);
+
+  const recentSessionRailProps = {
+    sessions,
+    activeSessionId: session?.id,
+    armedSessionId,
+    loading: sessionsLoading,
+    loadingMore: sessionsLoadingMore,
+    hasMore: sessionsHasMore,
+    onSelect: handleRecentSessionSelect,
+    onLoadMore: () => void loadMoreSessions(),
+  };
+
   return (
-    <div className="app-shell">
+    <div className={`app-shell${useFloatingSessionRail ? ' app-shell-h5' : ''}`}>
       <HistorySidebar
         open={sidebarOpen}
         sessions={sessions}
@@ -317,37 +330,33 @@ export function ChatView({
       />
 
       <div className={`app${showHomeWelcome ? ' app-home' : ''}`}>
-        <header className={`header${showHomeWelcome ? ' header-home' : ''}`}>
-          <div className="header-left">
-            <button
-              type="button"
-              className="header-menu-btn"
-              aria-label="展开历史对话"
-              onClick={() => setSidebarOpen(true)}
-            >
-              ☰
-            </button>
-            <TKMindAvatar size="sm" className="header-brand-avatar" />
-            <div>
-              <div className="header-title">{user?.displayName ?? 'TKMind'}</div>
-              <div className="header-sub">
-                {isConnectingTitle ? <ChatLoadingSpinner /> : null}
-                <span>{sessionTitle}</span>
+        <div className={useFloatingSessionRail ? 'header-shell header-shell-sticky' : undefined}>
+          <header className={`header${showHomeWelcome ? ' header-home' : ''}`}>
+            <div className="header-left">
+              <button
+                type="button"
+                className="header-menu-btn"
+                aria-label="展开历史对话"
+                onClick={() => setSidebarOpen(true)}
+              >
+                ☰
+              </button>
+              <TKMindAvatar size="sm" className="header-brand-avatar" />
+              <div>
+                <div className="header-title">{user?.displayName ?? 'TKMind'}</div>
+                <div className="header-sub">
+                  {isConnectingTitle ? <ChatLoadingSpinner /> : null}
+                  <span>{sessionTitle}</span>
+                </div>
               </div>
             </div>
-          </div>
-          <div className="header-actions header-actions-desktop">
-            <RecentSessionRail
-              sessions={sessions}
-              activeSessionId={session?.id}
-              armedSessionId={armedSessionId}
-              loading={sessionsLoading}
-              loadingMore={sessionsLoadingMore}
-              hasMore={sessionsHasMore}
-              chipWidth={desktopChipWidth}
-              onSelect={handleRecentSessionSelect}
-              onLoadMore={() => void loadMoreSessions()}
-            />
+            <div className="header-actions header-actions-desktop">
+              {!useFloatingSessionRail && (
+                <RecentSessionRail
+                  {...recentSessionRailProps}
+                  chipWidth={desktopChipWidth}
+                />
+              )}
             {typeof balanceCents === 'number' && (
               <BalanceRing
                 balanceCents={balanceCents}
@@ -359,6 +368,22 @@ export function ChatView({
               />
             )}
             <NotificationCenter onOpenRecharge={() => openRecharge(false)} />
+            <button
+              type="button"
+              className="header-icon-btn"
+              aria-label="新聊天"
+              title="新聊天"
+              onClick={() => void handleNewSession()}
+            >
+              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path
+                  d="M12 5v14M5 12h14"
+                  stroke="currentColor"
+                  strokeWidth="1.75"
+                  strokeLinecap="round"
+                />
+              </svg>
+            </button>
             {onOpenAdmin && (
               <button type="button" className="ghost-btn" onClick={onOpenAdmin}>
                 管理
@@ -374,9 +399,6 @@ export function ChatView({
                 我的空间
               </button>
             )}
-            <button type="button" className="ghost-btn" onClick={() => void handleNewSession()}>
-              新会话
-            </button>
             {user && <WechatAccountButton returnTo={window.location.pathname} />}
             {onLogout && (
               <button type="button" className="ghost-btn logout-btn" onClick={onLogout}>
@@ -386,17 +408,12 @@ export function ChatView({
           </div>
 
           <div className="header-actions header-actions-mobile">
-            <RecentSessionRail
-              sessions={sessions}
-              activeSessionId={session?.id}
-              armedSessionId={armedSessionId}
-              loading={sessionsLoading}
-              loadingMore={sessionsLoadingMore}
-              hasMore={sessionsHasMore}
-              chipWidth={null}
-              onSelect={handleRecentSessionSelect}
-              onLoadMore={() => void loadMoreSessions()}
-            />
+            {!useFloatingSessionRail && (
+              <RecentSessionRail
+                {...recentSessionRailProps}
+                chipWidth={null}
+              />
+            )}
             {typeof balanceCents === 'number' && (
               <BalanceRing
                 balanceCents={balanceCents}
@@ -408,6 +425,22 @@ export function ChatView({
               />
             )}
             <NotificationCenter onOpenRecharge={() => openRecharge(false)} />
+            <button
+              type="button"
+              className="header-icon-btn"
+              aria-label="新聊天"
+              title="新聊天"
+              onClick={() => void handleNewSession()}
+            >
+              <svg width="18" height="18" viewBox="0 0 24 24" fill="none" aria-hidden="true">
+                <path
+                  d="M12 5v14M5 12h14"
+                  stroke="currentColor"
+                  strokeWidth="1.75"
+                  strokeLinecap="round"
+                />
+              </svg>
+            </button>
             {onOpenSpace && (
               <button
                 type="button"
@@ -434,6 +467,14 @@ export function ChatView({
             />
           </div>
         </header>
+        {useFloatingSessionRail && (
+          <RecentSessionRail
+            {...recentSessionRailProps}
+            variant="floating"
+            chipWidth={null}
+          />
+        )}
+        </div>
 
         {!online && (
           <div className="banner banner-offline">网络已断开，请检查连接后重试</div>
diff --git a/src/index.css b/src/index.css
index 6489626..2e4bfe7 100644
--- a/src/index.css
+++ b/src/index.css
@@ -645,6 +645,56 @@ body,
   background: rgba(255, 255, 255, 0.03);
 }
 
+.header-shell-sticky {
+  position: sticky;
+  top: 0;
+  z-index: 2;
+}
+
+.header-shell-sticky .header {
+  position: static;
+  top: auto;
+  z-index: auto;
+  border-bottom: none;
+}
+
+.app-shell-h5 .header-session-rail-floating {
+  display: flex;
+  align-items: center;
+  gap: 0;
+  width: 100%;
+  max-width: none;
+  flex: none;
+  padding: 8px 12px;
+  box-sizing: border-box;
+  background: var(--color-bg-base);
+  border-bottom: 1px solid var(--color-border);
+  -webkit-overflow-scrolling: touch;
+}
+
+.app-shell-h5 .header-shell-sticky:has(.header-home) .header-session-rail-floating {
+  background: rgba(12, 18, 30, 0.72);
+  backdrop-filter: blur(14px);
+  border-bottom-color: rgba(103, 123, 156, 0.18);
+}
+
+.app-shell-h5 .header-session-rail-floating .header-session-rail-arrow {
+  display: none;
+}
+
+.app-shell-h5 .header-session-rail-floating .header-session-rail-track {
+  --header-session-chip-width: calc((100% - 16px) / 3);
+  grid-auto-columns: calc((100% - 16px) / 3);
+  gap: 8px;
+  width: 100%;
+  touch-action: pan-x;
+}
+
+.app-shell-h5 .header-session-rail-floating .header-session-chip {
+  min-height: 34px;
+  padding: 6px 8px;
+}
+
 .header-icon-btn {
   display: flex;
   align-items: center;
diff --git a/src/utils/wechat.ts b/src/utils/wechat.ts
index 449c2ea..5a0bc09 100644
--- a/src/utils/wechat.ts
+++ b/src/utils/wechat.ts
@@ -89,6 +89,15 @@ export function isWechatContext(options?: {
   return isWechatEntryUrl(options?.search);
 }
 
+/** 手机 H5 或微信内置浏览器：导航会话标签采用下方悬浮条布局 */
+export function isH5OrWechatClient(options?: {
+  userAgent?: string;
+  search?: string;
+  serverInWechat?: boolean;
+}) {
+  return isMobileBrowser(options?.userAgent) || isWechatContext(options);
+}
+
 export function buildWechatAuthorizeUrl(options?: {
   returnTo?: string;
   utmSource?: string;