diff --git a/Dockerfile b/Dockerfile
index 6b22924..3103a68 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -75,6 +75,7 @@ RUN --mount=type=cache,target=/root/.cache/go-build \
 FROM golang:1.24-alpine AS agent-builder
 
 ARG VERSION
+ARG AGENT_VERSION
 ARG BUILD_TIME
 ARG TARGETARCH
 
@@ -92,13 +93,13 @@ COPY agent/ ./
 # Go 在 CGO_ENABLED=0 下可原生交叉编译，无需 QEMU，故一次性产出全部目标，
 # 与 router/agent_static.go 的下载清单保持一致，避免 ARM 主机下载 404。 // Logan.Li
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build \
-    -ldflags="-s -w -X main.version=${VERSION} -X main.buildTime=${BUILD_TIME}" \
+    -ldflags="-s -w -X main.version=${AGENT_VERSION} -X main.buildTime=${BUILD_TIME}" \
     -o bin/aiops-agent-linux-amd64 .
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build \
-    -ldflags="-s -w -X main.version=${VERSION} -X main.buildTime=${BUILD_TIME}" \
+    -ldflags="-s -w -X main.version=${AGENT_VERSION} -X main.buildTime=${BUILD_TIME}" \
     -o bin/aiops-agent-linux-arm64 .
 RUN CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build \
-    -ldflags="-s -w -X main.version=${VERSION} -X main.buildTime=${BUILD_TIME}" \
+    -ldflags="-s -w -X main.version=${AGENT_VERSION} -X main.buildTime=${BUILD_TIME}" \
     -o bin/aiops-agent-windows-amd64.exe .
 
 # ==================== Stage 4: Runtime ====================
diff --git a/backend/main.go b/backend/main.go
index cb246c7..31ac9d8 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -215,6 +215,8 @@ func main() {
 	systask.Init(db)
 
 	// 注册路由
+	// 把编译期注入的版本号透传给 router，供 /agent/arch 返回真实版本。 // Logan.Li
+	router.AppVersion = Version
 	router.Register(r, db, log, cfg, cache)
 
 	// 用户定时任务调度（Linux 5 段 crontab）// Logan.Li
diff --git a/backend/router/agent_static.go b/backend/router/agent_static.go
index cb83a05..bb3e205 100644
--- a/backend/router/agent_static.go
+++ b/backend/router/agent_static.go
@@ -22,6 +22,10 @@ var agentBinaryFiles = map[string]string{
 	"windows-amd64": "aiops-agent-windows-amd64.exe",
 }
 
+// AppVersion 由 main 在启动时注入，用于 /agent/arch 返回真实版本号；
+// 此前该字段硬编码为 "1.0.0"，发版后接口版本与实际不符。 // Logan.Li
+var AppVersion = "dev"
+
 // registerAgentDownloads 注册 Agent 安装脚本和二进制下载路由，避免维护 backend/agent 重复目录。 // Logan.Li
 func registerAgentDownloads(r *gin.Engine, log *zap.Logger) {
 	paths := resolveAgentStaticPaths(log)
@@ -34,7 +38,7 @@ func registerAgentDownloads(r *gin.Engine, log *zap.Logger) {
 		}
 		downloads := availableAgentDownloads(paths.binDir)
 		c.JSON(http.StatusOK, gin.H{
-			"version":   "1.0.0",
+			"version":   AppVersion,
 			"downloads": downloads,
 			"install":   fmt.Sprintf("curl -fsSL %s/agent/install.sh | sudo bash -s -- --server %s --token <token>", base, base),
 		})
diff --git a/docker-compose.yml b/docker-compose.yml
index 0139c51..a939a28 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -61,6 +61,8 @@ services:
       dockerfile: Dockerfile
       args:
         VERSION: ${VERSION:-dev}
+        # AGENT_VERSION 与镜像版本解耦：纯后端/前端改动不必让所有主机重推 Agent。 // Logan.Li
+        AGENT_VERSION: ${AGENT_VERSION:-v1.0.2}
         BUILD_TIME: ${BUILD_TIME:-unknown}
         GIT_COMMIT: ${GIT_COMMIT:-unknown}
     container_name: aiops
diff --git a/frontend/src/components/layout/MainLayout.tsx b/frontend/src/components/layout/MainLayout.tsx
index 90a4b9b..b90a07c 100644
--- a/frontend/src/components/layout/MainLayout.tsx
+++ b/frontend/src/components/layout/MainLayout.tsx
@@ -9,6 +9,7 @@ import { authApi } from '@/api';
 import type { JsonData } from '@/types/common';
 import { useTranslation } from 'react-i18next';
 import { SessionWatermark } from '@/components/common/SessionWatermark';
+import { useAppVersion } from '@/hooks/use-app-version';
 import { shouldProtectPage } from '@/components/common/sensitivePageWatermark';
 
 /**
@@ -16,6 +17,8 @@ import { shouldProtectPage } from '@/components/common/sensitivePageWatermark';
  * 侧栏 + 顶栏 + 面包屑 + 内容区，间距由 --layout-* 令牌驱动 // Logan.Li
  */
 export function MainLayout() {
+  // 页脚版本号同样取自后端 /version。 // Logan.Li
+  const appVersion = useAppVersion();
   const { t } = useTranslation();
   const { sidebarCollapsed } = useThemeStore();
   const token = useUserStore((s) => s.token);
@@ -97,7 +100,7 @@ export function MainLayout() {
         <footer className="dg-app-footer">
           <div className="flex items-center justify-between text-xs dg-text-muted">
             <span>{t('login.title')}</span>
-            <span>v1.0.0</span>
+            <span>{appVersion || 'v1.0.0'}</span>
           </div>
         </footer>
       </div>
diff --git a/frontend/src/components/layout/Sidebar.tsx b/frontend/src/components/layout/Sidebar.tsx
index bf7b7f5..285f06a 100644
--- a/frontend/src/components/layout/Sidebar.tsx
+++ b/frontend/src/components/layout/Sidebar.tsx
@@ -44,6 +44,7 @@ import {
 import { Button } from '@/components/ui/button';
 import { ScrollArea } from '@/components/ui/scroll-area';
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip';
+import { useAppVersion } from '@/hooks/use-app-version';
 
 interface MenuItem {
   id: string;
@@ -363,6 +364,8 @@ interface SidebarProps {
 }
 
 export function Sidebar({ mobileOpen, onMobileClose }: SidebarProps) {
+  // 版本号从后端 /version 读取，避免发版后界面仍显示硬编码的旧版本。 // Logan.Li
+  const appVersion = useAppVersion();
   const { t } = useTranslation();
   const { sidebarCollapsed, toggleSidebar } = useThemeStore();
   const { hasPermission } = usePermission();
@@ -433,7 +436,7 @@ export function Sidebar({ mobileOpen, onMobileClose }: SidebarProps) {
       {!isCollapsed && (
         <div className="px-3 py-2 border-t border-[var(--dg-border)] flex-shrink-0">
           <div className="text-[10px] text-[var(--dg-text-muted)] text-center">
-            AIOps v1.0.0
+            AIOps {appVersion || 'v1.0.0'}
           </div>
         </div>
       )}
diff --git a/frontend/src/hooks/use-app-version.ts b/frontend/src/hooks/use-app-version.ts
new file mode 100644
index 0000000..4eea39c
--- /dev/null
+++ b/frontend/src/hooks/use-app-version.ts
@@ -0,0 +1,58 @@
+import { useEffect, useState } from 'react';
+
+/**
+ * 应用版本信息。
+ *
+ * 版本号此前在后端 /version 已提供（含 build_time / git_commit），
+ * 但侧边栏与页脚硬编码了 v1.0.0，导致发版后界面显示陈旧。
+ * 这里统一从 /version 读取并做模块级缓存，避免多处重复请求。 // Logan.Li
+ */
+export interface AppVersion {
+  version: string;
+  build_time?: string;
+  git_commit?: string;
+  mode?: string;
+}
+
+// 模块级缓存：整个会话只请求一次。
+let cached: AppVersion | null = null;
+let inflight: Promise<AppVersion | null> | null = null;
+
+function fetchVersion(): Promise<AppVersion | null> {
+  if (cached) return Promise.resolve(cached);
+  if (inflight) return inflight;
+
+  // 注意：/version 挂在根路径，不带 /api/v1 前缀，故不能用统一 request 封装。
+  inflight = fetch('/version')
+    .then((res) => (res.ok ? res.json() : null))
+    .then((data) => {
+      if (data && typeof data.version === 'string') {
+        cached = data as AppVersion;
+        return cached;
+      }
+      return null;
+    })
+    .catch(() => null)
+    .finally(() => {
+      inflight = null;
+    });
+
+  return inflight;
+}
+
+/** 读取后端版本号；失败时返回空串，调用方负责兜底显示。 */
+export function useAppVersion(): string {
+  const [version, setVersion] = useState<string>(cached?.version ?? '');
+
+  useEffect(() => {
+    let alive = true;
+    fetchVersion().then((v) => {
+      if (alive && v?.version) setVersion(v.version);
+    });
+    return () => {
+      alive = false;
+    };
+  }, []);
+
+  return version;
+}