diff --git a/Dockerfile b/Dockerfile
index c9fcf301..42726903 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,7 +36,7 @@ RUN pnpm run build
 FROM ${GOLANG_IMAGE} AS backend-builder
 
 # Build arguments for version info (set by CI)
-ARG VERSION=docker
+ARG VERSION=
 ARG COMMIT=docker
 ARG DATE
 ARG GOPROXY
@@ -63,7 +63,7 @@ COPY --from=frontend-builder /app/backend/internal/web/dist ./internal/web/dist
 # Build the binary (BuildType=release for CI builds, embed frontend)
 RUN CGO_ENABLED=0 GOOS=linux go build \
     -tags embed \
-    -ldflags="-s -w -X main.Commit=${COMMIT} -X main.Date=${DATE:-$(date -u +%Y-%m-%dT%H:%M:%SZ)} -X main.BuildType=release" \
+    -ldflags="-s -w -X main.Version=${VERSION} -X main.Commit=${COMMIT} -X main.Date=${DATE:-$(date -u +%Y-%m-%dT%H:%M:%SZ)} -X main.BuildType=release" \
     -o /app/sub2api \
     ./cmd/server
 
diff --git a/backend/cmd/server/main.go b/backend/cmd/server/main.go
index 31f2e1d1..63095209 100644
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@@ -40,7 +40,12 @@ var (
 )
 
 func init() {
-	// Read version from embedded VERSION file
+	// 如果 Version 已通过 ldflags 注入（例如 -X main.Version=...），则不要覆盖。
+	if strings.TrimSpace(Version) != "" {
+		return
+	}
+
+	// 默认从 embedded VERSION 文件读取版本号（编译期打包进二进制）。
 	Version = strings.TrimSpace(embeddedVersion)
 	if Version == "" {
 		Version = "0.0.0-dev"
diff --git a/build_image_aicodex.sh b/build_image_aicodex.sh
index 7b40652c..f6672ce7 100755
--- a/build_image_aicodex.sh
+++ b/build_image_aicodex.sh
@@ -1,8 +1,32 @@
 #!/bin/bash
 # 本地构建镜像的快速脚本，避免在命令行反复输入构建参数。
 
-docker build -t yangjianbo/aicodex2api:latest \
-    --build-arg GOPROXY=https://goproxy.cn,direct \
-    --build-arg GOSUMDB=sum.golang.google.cn \
-    -f Dockerfile \
-    .
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="${SCRIPT_DIR}"
+
+VERSION_FILE="${REPO_ROOT}/backend/cmd/server/VERSION"
+VERSION=""
+if [ -f "${VERSION_FILE}" ]; then
+  VERSION="$(tr -d '\r\n' < "${VERSION_FILE}")"
+fi
+
+if [ -z "${VERSION}" ]; then
+  echo "未找到版本号（${VERSION_FILE} 为空或不存在），将仅构建 latest 镜像" >&2
+  VERSION="docker"
+fi
+
+COMMIT="$(git -C "${REPO_ROOT}" rev-parse --short HEAD 2>/dev/null || echo docker)"
+DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+
+docker build \
+  -t "yangjianbo/aicodex2api:latest" \
+  -t "yangjianbo/aicodex2api:${VERSION}" \
+  --build-arg VERSION="${VERSION}" \
+  --build-arg COMMIT="${COMMIT}" \
+  --build-arg DATE="${DATE}" \
+  --build-arg GOPROXY=https://goproxy.cn,direct \
+  --build-arg GOSUMDB=sum.golang.google.cn \
+  -f "${REPO_ROOT}/Dockerfile" \
+  "${REPO_ROOT}"