diff --git a/buildinfo/buildinfo.go b/buildinfo/buildinfo.go
new file mode 100644
index 0000000..897c0c8
--- /dev/null
+++ b/buildinfo/buildinfo.go
@@ -0,0 +1,25 @@
+// Package buildinfo 保存编译时通过 -ldflags -X 注入的版本信息，
+// 部署时由 install_linux.sh 注入 Git 提交哈希与编译时间。
+package buildinfo
+
+import "fmt"
+
+// Commit 是编译时的 Git 短提交哈希（-X go_blog/buildinfo.Commit=<sha>）。
+// 未注入时回退为 "dev"。
+var Commit string
+
+// BuildTime 是编译时间（UTC，-X go_blog/buildinfo.BuildTime=<time>）。
+// 未注入时回退为 "unknown"。
+var BuildTime string
+
+// String 返回展示用的版本字符串，如 "v443eccb · 2026-08-27T12:00:00Z"。
+func String() string {
+	commit, buildTime := Commit, BuildTime
+	if commit == "" {
+		commit = "dev"
+	}
+	if buildTime == "" {
+		buildTime = "unknown"
+	}
+	return fmt.Sprintf("v%s · %s", commit, buildTime)
+}
diff --git a/handlers/helpers.go b/handlers/helpers.go
index 1cc80f6..b08d99c 100644
--- a/handlers/helpers.go
+++ b/handlers/helpers.go
@@ -49,6 +49,7 @@ func DefaultData(c *gin.Context) gin.H {
 	siteFooterText, _ := c.Get("site_footer_text")
 	navLinks, _ := c.Get("nav_links")
 	csrfToken, _ := c.Get("csrf_token")
+	buildInfo, _ := c.Get("build_info")
 
 	return gin.H{
 		"Tr":               tr,
@@ -71,6 +72,7 @@ func DefaultData(c *gin.Context) gin.H {
 		"SiteFooterText":   siteFooterText,
 		"NavLinks":         navLinks,
 		"CSRFToken":        csrfToken,
+		"BuildInfo":        buildInfo,
 	}
 }
 
diff --git a/install_linux.sh b/install_linux.sh
index 398c900..18fb236 100755
--- a/install_linux.sh
+++ b/install_linux.sh
@@ -22,7 +22,7 @@ echo "拉取最新代码..."
 git pull
 
 echo "编译 Go 程序..."
-go build -o "${BINARY_NAME}" .
+go build -ldflags "-X go_blog/buildinfo.Commit=$(git rev-parse --short HEAD) -X go_blog/buildinfo.BuildTime=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" -o "${BINARY_NAME}" .
 
 echo "检查系统用户..."
 if ! id -u "${SERVICE_USER}" >/dev/null 2>&1; then
diff --git a/middleware/auth.go b/middleware/auth.go
index 5b42f5d..b294454 100644
--- a/middleware/auth.go
+++ b/middleware/auth.go
@@ -8,6 +8,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
 
+	"go_blog/buildinfo"
 	"go_blog/i18n"
 	"go_blog/models"
 )
@@ -224,6 +225,9 @@ func SetUserContext(db *gorm.DB) gin.HandlerFunc {
 		navLinks := models.GetNavLinks()
 		c.Set("nav_links", navLinks)
 
+		// --- 构建信息（编译时注入的 Git 版本与编译时间）---
+		c.Set("build_info", buildinfo.String())
+
 		c.Next()
 	}
 }
diff --git a/templates/layouts/base.html b/templates/layouts/base.html
index c8f5a7f..f39f576 100644
--- a/templates/layouts/base.html
+++ b/templates/layouts/base.html
@@ -173,6 +173,9 @@
             <div class="text-center text-gray-500 text-xs">
                 {{if .SiteFooterText}}{{.SiteFooterText}}{{else}}{{index .Tr "footer_text"}}{{end}}
             </div>
+            <div class="text-center text-gray-400 text-[10px] mt-1">
+                {{.BuildInfo}}
+            </div>
         </div>
     </footer>
     <script>