diff --git a/frontend/src/pages/Work.tsx b/frontend/src/pages/Work.tsx
index e38f6c65..94a39cf7 100644
--- a/frontend/src/pages/Work.tsx
+++ b/frontend/src/pages/Work.tsx
@@ -1059,6 +1059,9 @@ export default function Work() {
       if (!checkInPhotoUrls.length) {
         throw new Error("请先上传现场照片");
       }
+      if (!checkInForm.remark?.trim()) {
+        throw new Error("请填写打卡备注");
+      }
       await saveWorkCheckIn({
         locationText: checkInForm.locationText.trim(),
         remark: checkInForm.remark?.trim() || undefined,
@@ -2559,7 +2562,7 @@ function CheckInPanel({
       </div>
 
       <div className="mt-4">
-        <p className="mb-1 text-sm font-medium text-slate-900 dark:text-white">打卡备注 (选填)</p>
+        <p className="mb-1 text-sm font-medium text-slate-900 dark:text-white">打卡备注 (必填)</p>
         <textarea
           rows={2}
           value={checkInForm.remark ?? ""}