diff --git a/account/urls/oj.py b/account/urls/oj.py
index dbdbc12..35c2155 100644
--- a/account/urls/oj.py
+++ b/account/urls/oj.py
@@ -4,7 +4,7 @@ from ..views.oj import (ApplyResetPasswordAPI, ResetPasswordAPI,
                         UserChangePasswordAPI, UserRegisterAPI, UserChangeEmailAPI,
                         UserLoginAPI, UserLogoutAPI, UsernameOrEmailCheck,
                         AvatarUploadAPI, TwoFactorAuthAPI, UserProfileAPI,
-                        UserRankAPI, CheckTFARequiredAPI, SessionManagementAPI,
+                        UserRankAPI, UserActivityRankAPI, CheckTFARequiredAPI, SessionManagementAPI,
                         ProfileProblemDisplayIDRefreshAPI, OpenAPIAppkeyAPI, SSOAPI)
 
 from utils.captcha.views import CaptchaAPIView
@@ -25,6 +25,7 @@ urlpatterns = [
     path("tfa_required", CheckTFARequiredAPI.as_view()),
     path("two_factor_auth", TwoFactorAuthAPI.as_view(),),
     path("user_rank", UserRankAPI.as_view()),
+    path("user_activity_rank", UserActivityRankAPI.as_view()),
     path("sessions", SessionManagementAPI.as_view()),
     path("open_api_appkey", OpenAPIAppkeyAPI.as_view(),),
     path("sso", SSOAPI.as_view())
diff --git a/account/views/oj.py b/account/views/oj.py
index aff7d62..401c893 100644
--- a/account/views/oj.py
+++ b/account/views/oj.py
@@ -9,9 +9,11 @@ from django.template.loader import render_to_string
 from django.utils.decorators import method_decorator
 from django.utils.timezone import now
 from django.views.decorators.csrf import ensure_csrf_cookie, csrf_exempt
+from django.db.models import Count
 from otpauth import OtpAuth
 
 from problem.models import Problem
+from submission.models import Submission
 from utils.constants import ContestRuleType
 from options.options import SysOptions
 from utils.api import APIView, validate_serializer, CSRFExemptAPIView
@@ -394,6 +396,16 @@ class UserRankAPI(APIView):
         return self.success(self.paginate_data(request, profiles, RankInfoSerializer))
 
 
+class UserActivityRankAPI(APIView):
+    def get(self, request):
+        start = request.GET.get("start")
+        if not start:
+            return self.error("start time is required")
+        submissions = Submission.objects.filter(contest_id__isnull=True, create_time__gte=start)
+        counts = submissions.values("username").annotate(count=Count("id")).order_by("-count")
+        return self.success(list(counts)[:10])
+
+
 class ProfileProblemDisplayIDRefreshAPI(APIView):
     @login_required
     def get(self, request):