diff --git a/pages/api/time/ranges/[id].js b/pages/api/time/ranges/[id].js
index 36a540a..c03ee9d 100644
--- a/pages/api/time/ranges/[id].js
+++ b/pages/api/time/ranges/[id].js
@@ -2,10 +2,11 @@ import {
   deleteTimeRange,
   getLimit,
   authenticate,
+  updateUsername,
   updateUsernameWithLimit,
 } from "../../../../libs/db";
 
-import { addAPIQPS } from '../../../../libs/stats';
+import { addAPIQPS } from "../../../../libs/stats";
 
 export default function handler(req, res) {
   addAPIQPS();
@@ -43,6 +44,16 @@ export default function handler(req, res) {
       return;
     }
 
+    // admin update username
+    const { token } = req.body;
+    if (authenticate(token)) {
+      updateUsername.run(username, id);
+      res.status(200).json({
+        success: true,
+      });
+      return;
+    }
+
     try {
       const limit = getLimit();
       updateUsernameWithLimit(username, id, limit);
diff --git a/pages/time.js b/pages/time.js
index c47f1aa..f4aa2db 100644
--- a/pages/time.js
+++ b/pages/time.js
@@ -34,6 +34,29 @@ export default function Time(props) {
 
   const router = useRouter();
 
+  const updateUsernameByAdmin = (id, username) => {
+    fetch(`${prefix}/api/time/ranges/${id}`, {
+      method: "PUT",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify({
+        username,
+        token,
+      }),
+    })
+      .then((res) => res.json())
+      .then((res) => {
+        if (res.error) {
+          setSnackbarError(true);
+          setSnackbarErrorMessage(res.error);
+        } else {
+          setSnackbarSuccess(true);
+          refreshRanges();
+        }
+      });
+  };
+
   const getStats = () => {
     fetch(`${prefix}/api/stats`, {
       method: "GET",
@@ -330,16 +353,21 @@ export default function Time(props) {
                     {range.username ? range.username : "抢！"}
                   </Button>
                   {isAdmin() && (
-                    <Button
-                      sx={{
-                        userSelect: "none",
-                      }}
-                      variant="contained"
-                      color="secondary"
-                      onClick={() => deleteRange(range.id)}
-                    >
-                      删除
-                    </Button>
+                    <>
+                      <Button
+                        variant="contained"
+                        onClick={() => updateUsernameByAdmin(range.id, "")}
+                      >
+                        清空
+                      </Button>
+                      <Button
+                        variant="contained"
+                        color="secondary"
+                        onClick={() => deleteRange(range.id)}
+                      >
+                        删除
+                      </Button>
+                    </>
                   )}
                 </TableCell>
               </TableRow>