diff --git a/blocksuite/affine/shared/package.json b/blocksuite/affine/shared/package.json
index a596c8b8a..78200474a 100644
--- a/blocksuite/affine/shared/package.json
+++ b/blocksuite/affine/shared/package.json
@@ -59,7 +59,6 @@
     "./consts": "./src/consts/index.ts",
     "./types": "./src/types/index.ts",
     "./commands": "./src/commands/index.ts",
-    "./mixins": "./src/mixins/index.ts",
     "./theme": "./src/theme/index.ts",
     "./styles": "./src/styles/index.ts",
     "./services": "./src/services/index.ts",
diff --git a/blocksuite/affine/shared/src/mixins/index.ts b/blocksuite/affine/shared/src/mixins/index.ts
deleted file mode 100644
index cb0ff5c3b..000000000
--- a/blocksuite/affine/shared/src/mixins/index.ts
+++ /dev/null
@@ -1 +0,0 @@
-export {};
diff --git a/blocksuite/affine/shared/src/services/index.ts b/blocksuite/affine/shared/src/services/index.ts
index 294e8f064..12e444094 100644
--- a/blocksuite/affine/shared/src/services/index.ts
+++ b/blocksuite/affine/shared/src/services/index.ts
@@ -18,4 +18,5 @@ export * from './quick-search-service';
 export * from './sidebar-service';
 export * from './telemetry-service';
 export * from './theme-service';
+export * from './user-service';
 export * from './virtual-keyboard-service';
diff --git a/blocksuite/affine/shared/src/services/user-service/index.ts b/blocksuite/affine/shared/src/services/user-service/index.ts
new file mode 100644
index 000000000..2a4ac6160
--- /dev/null
+++ b/blocksuite/affine/shared/src/services/user-service/index.ts
@@ -0,0 +1,3 @@
+export * from './types';
+export * from './user-list-service';
+export * from './user-service';
diff --git a/blocksuite/affine/shared/src/services/user-service/types.ts b/blocksuite/affine/shared/src/services/user-service/types.ts
new file mode 100644
index 000000000..5096689a2
--- /dev/null
+++ b/blocksuite/affine/shared/src/services/user-service/types.ts
@@ -0,0 +1,25 @@
+export type RemovedUserInfo = {
+  id: string;
+  removed: true;
+};
+
+export type ExistedUserInfo = {
+  id: string;
+  name: string;
+  avatar: string;
+  removed?: false;
+};
+
+export type AffineUserInfo = RemovedUserInfo | ExistedUserInfo;
+
+export function isRemovedUserInfo(
+  userInfo: AffineUserInfo
+): userInfo is RemovedUserInfo {
+  return Boolean('removed' in userInfo && userInfo.removed);
+}
+
+export function isExistedUserInfo(
+  userInfo: AffineUserInfo
+): userInfo is ExistedUserInfo {
+  return !isRemovedUserInfo(userInfo);
+}
diff --git a/blocksuite/affine/shared/src/services/user-service/user-list-service.ts b/blocksuite/affine/shared/src/services/user-service/user-list-service.ts
new file mode 100644
index 000000000..ddf898f57
--- /dev/null
+++ b/blocksuite/affine/shared/src/services/user-service/user-list-service.ts
@@ -0,0 +1,26 @@
+import { createIdentifier } from '@blocksuite/global/di';
+import type { ExtensionType } from '@blocksuite/store';
+import type { Signal } from '@preact/signals-core';
+
+import type { AffineUserInfo } from './types';
+
+export interface UserListService {
+  users$: Signal<AffineUserInfo[]>;
+  hasMore$: Signal<boolean>;
+  loadMore(): void;
+  search(keyword: string): void;
+}
+
+export const UserListProvider = createIdentifier<UserListService>(
+  'affine-user-list-service'
+);
+
+export function UserListServiceExtension(
+  service: UserListService
+): ExtensionType {
+  return {
+    setup(di) {
+      di.addImpl(UserListProvider, () => service);
+    },
+  };
+}
diff --git a/blocksuite/affine/shared/src/services/user-service/user-service.ts b/blocksuite/affine/shared/src/services/user-service/user-service.ts
new file mode 100644
index 000000000..a9c38db64
--- /dev/null
+++ b/blocksuite/affine/shared/src/services/user-service/user-service.ts
@@ -0,0 +1,22 @@
+import { createIdentifier } from '@blocksuite/global/di';
+import type { ExtensionType } from '@blocksuite/store';
+import type { Signal } from '@preact/signals-core';
+
+import type { AffineUserInfo } from './types';
+
+export interface UserService {
+  getCurrentUser(): AffineUserInfo;
+  getUserInfo(id: string): Signal<AffineUserInfo | null>;
+}
+
+export const UserProvider = createIdentifier<UserService>(
+  'affine-user-service'
+);
+
+export function UserServiceExtension(service: UserService): ExtensionType {
+  return {
+    setup(di) {
+      di.addImpl(UserProvider, () => service);
+    },
+  };
+}