diff --git a/.yarn/versions/f94bc75b.yml b/.yarn/versions/f94bc75b.yml
new file mode 100644
index 0000000..85ee0e5
--- /dev/null
+++ b/.yarn/versions/f94bc75b.yml
@@ -0,0 +1,3 @@
+releases:
+  "@aoi-js/frontend": patch
+  "@aoi-js/server": patch
diff --git a/apps/frontend/src/components/contest/RanklistRenderer.vue b/apps/frontend/src/components/contest/RanklistRenderer.vue
index 7ae9527..c2005c8 100644
--- a/apps/frontend/src/components/contest/RanklistRenderer.vue
+++ b/apps/frontend/src/components/contest/RanklistRenderer.vue
@@ -64,9 +64,8 @@ import { ref, computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { RouterLink } from 'vue-router'
 
-import RanklistTopstars from '../contest/RanklistTopstars.vue'
-
 import { useRanklistRenderer } from './RanklistRenderer'
+import RanklistTopstars from './RanklistTopstars.vue'
 
 import PrincipalProfile from '@/components/utils/PrincipalProfile.vue'
 import { renderMarkdown } from '@/utils/markdown'
@@ -85,3 +84,13 @@ const length = computed(() =>
 
 const { admin, participantUrl, problemUrl, solutionUrl } = useRanklistRenderer()
 </script>
+
+<style scoped>
+td:not(:last-child) {
+  border-right: 1px solid #eee;
+}
+
+th {
+  border-bottom: 2px solid #eee;
+}
+</style>
diff --git a/apps/frontend/src/locales/en.yaml b/apps/frontend/src/locales/en.yaml
index b2736fe..19a5a52 100644
--- a/apps/frontend/src/locales/en.yaml
+++ b/apps/frontend/src/locales/en.yaml
@@ -128,6 +128,7 @@ term:
   access-level: Access Level
   rules: Rules
   ip: IP
+  banned: Banned
 
 common:
   created-at: Created at
diff --git a/apps/frontend/src/locales/zh-Hans.yml b/apps/frontend/src/locales/zh-Hans.yml
index d02d1a3..2a58fdf 100644
--- a/apps/frontend/src/locales/zh-Hans.yml
+++ b/apps/frontend/src/locales/zh-Hans.yml
@@ -128,6 +128,7 @@ term:
   access-level: 访问等级
   rules: 规则
   ip: IP 地址
+  banned: 封禁
 
 common:
   created-at: 创建于
diff --git a/apps/frontend/src/pages/org/[orgId]/contest/[contestId]/participant/[userId].vue b/apps/frontend/src/pages/org/[orgId]/contest/[contestId]/participant/[userId].vue
index e682dc9..5e8f4f6 100644
--- a/apps/frontend/src/pages/org/[orgId]/contest/[contestId]/participant/[userId].vue
+++ b/apps/frontend/src/pages/org/[orgId]/contest/[contestId]/participant/[userId].vue
@@ -7,6 +7,7 @@
     <SettingsEditor :endpoint="`contest/${contestId}/participant/admin/${userId}`">
       <template v-slot="scoped">
         <VCombobox v-model="scoped.value.tags" :label="t('term.tags')" multiple chips />
+        <VCheckbox v-model="scoped.value.banned" :label="t('term.banned')" />
       </template>
     </SettingsEditor>
     <VDivider />
@@ -26,7 +27,7 @@ import { useI18n } from 'vue-i18n'
 import type { IContestDTO } from '@/components/contest/types'
 import PrincipalProfile from '@/components/utils/PrincipalProfile.vue'
 import SettingsEditor from '@/components/utils/SettingsEditor.vue'
-import { useContestCapability, useContestSettings } from '@/utils/contest/inject'
+import { useContestCapability } from '@/utils/contest/inject'
 
 defineProps<{
   orgId: string
diff --git a/apps/server/src/db/contest.ts b/apps/server/src/db/contest.ts
index 4ce9472..04ec488 100644
--- a/apps/server/src/db/contest.ts
+++ b/apps/server/src/db/contest.ts
@@ -42,6 +42,7 @@ export interface IContestParticipant {
   createdAt: number
   updatedAt: number
   tags?: string[]
+  banned?: boolean
 }
 
 export interface IContestProblem {
diff --git a/apps/server/src/routes/contest/participant/index.ts b/apps/server/src/routes/contest/participant/index.ts
index fee9e84..dfa1f80 100644
--- a/apps/server/src/routes/contest/participant/index.ts
+++ b/apps/server/src/routes/contest/participant/index.ts
@@ -121,7 +121,8 @@ const contestParticipantAdminRoutes = defineRoutes(async (s) => {
           userId: T.UUID()
         }),
         body: T.Object({
-          tags: T.Optional(T.Array(T.String()))
+          tags: T.Optional(T.Array(T.String())),
+          banned: T.Optional(T.Boolean())
         })
       }
     },
@@ -139,9 +140,4 @@ const contestParticipantAdminRoutes = defineRoutes(async (s) => {
       return 0
     }
   )
-
-  s.delete('/:userId', {}, async () => {
-    // TODO: delete participant
-    return s.httpErrors.notImplemented()
-  })
 })
diff --git a/apps/server/src/routes/contest/scoped.ts b/apps/server/src/routes/contest/scoped.ts
index 08b3265..fcbeb39 100644
--- a/apps/server/src/routes/contest/scoped.ts
+++ b/apps/server/src/routes/contest/scoped.ts
@@ -53,6 +53,8 @@ export const contestScopedRoutes = defineRoutes(async (s) => {
     })
     if (!participant) {
       ensureCapability(capability, CONTEST_CAPS.CAP_ACCESS, s.httpErrors.forbidden())
+    } else if (participant.banned) {
+      ensureCapability(capability, CONTEST_CAPS.CAP_ADMIN, s.httpErrors.forbidden())
     }
     req.provide(kContestContext, {
       _contestId: contestId,