diff --git a/scripts/sync-gitea.sh b/scripts/sync-gitea.sh
index 121ca40c..33f3cf12 100755
--- a/scripts/sync-gitea.sh
+++ b/scripts/sync-gitea.sh
@@ -58,6 +58,36 @@ remote_repo_reachable() {
     git ls-remote --exit-code origin HEAD >/dev/null 2>&1
 }
 
+current_branch_name() {
+    local branch
+    branch=$(git branch --show-current 2>/dev/null || true)
+    if [ -z "$branch" ]; then
+        branch="main"
+    fi
+    echo "$branch"
+}
+
+current_branch_needs_push() {
+    if ! git rev-parse --verify "@{upstream}" >/dev/null 2>&1; then
+        return 0
+    fi
+    [ "$(git rev-list --count @{upstream}..HEAD)" -gt 0 ]
+}
+
+main_ref_needs_push() {
+    if [ "$AUTO_PUSH_MAIN" != "1" ]; then
+        return 1
+    fi
+    if ! git rev-parse --verify "refs/remotes/origin/main" >/dev/null 2>&1; then
+        return 0
+    fi
+    ! git merge-base --is-ancestor "refs/remotes/origin/main" HEAD
+}
+
+needs_push() {
+    current_branch_needs_push || main_ref_needs_push
+}
+
 ensure_remote_repo() {
     if remote_repo_reachable; then
         log_info "远程仓库可访问: ${GIT_USER}/${REPO_NAME}"
@@ -186,12 +216,8 @@ push_changes() {
     log_info "推送到远程仓库..."
     
     # 获取当前分支
-    local branch=$(git branch --show-current 2>/dev/null || echo "main")
-    
-    # 如果分支为空，使用 main
-    if [ -z "$branch" ]; then
-        branch="main"
-    fi
+    local branch
+    branch=$(current_branch_name)
     
     ensure_remote_repo
 
@@ -238,7 +264,11 @@ push_changes() {
 full_sync() {
     init_repo
     commit_changes
-    push_changes
+    if needs_push; then
+        push_changes
+    else
+        log_info "没有需要推送的提交"
+    fi
 }
 
 auto_sync() {