diff --git a/web-admin/src/api/oaApproval.ts b/web-admin/src/api/oaApproval.ts
index 22a71257..52f54525 100644
--- a/web-admin/src/api/oaApproval.ts
+++ b/web-admin/src/api/oaApproval.ts
@@ -244,8 +244,37 @@ export function fetchOaInstanceDetail(id: string) {
   })
 }
 
-export function fetchOaTasks(kind: 'pending' | 'done' | 'mine' | 'cc') {
-  return request.get<{ list: any[] }>({ url: `${BASE}/tasks/${kind}` })
+export function fetchOaTasks(
+  kind: 'pending' | 'done' | 'mine' | 'cc',
+  params?: { readStatus?: 'unread' | 'read' | 'all' }
+) {
+  return request.get<{ list: any[] }>({
+    url: `${BASE}/tasks/${kind}`,
+    params: kind === 'cc' ? { readStatus: params?.readStatus ?? 'unread' } : undefined
+  })
+}
+
+export function fetchOaCcUnreadCount() {
+  return request.get<{ count: number }>({ url: `${BASE}/tasks/cc/unread-count` })
+}
+
+export function fetchMarkOaCcTaskRead(taskId: string) {
+  return request.post({
+    url: `${BASE}/tasks/${taskId}/read`,
+    showSuccessMessage: false
+  })
+}
+
+export function fetchBatchMarkOaCcTasksRead(ids: string[]) {
+  return request.post({
+    url: `${BASE}/tasks/cc/read-batch`,
+    data: { ids },
+    showSuccessMessage: true
+  })
+}
+
+export function formatOaCcUnreadBadgeCount(count: number): string {
+  return count > 99 ? '99+' : String(count)
 }
 
 export function fetchApproveOaTask(taskId: string, comment?: string) {