diff --git a/packages/hydrooj/src/handler/domain.ts b/packages/hydrooj/src/handler/domain.ts
index 9036b18a7..ac174b033 100644
--- a/packages/hydrooj/src/handler/domain.ts
+++ b/packages/hydrooj/src/handler/domain.ts
@@ -438,21 +438,15 @@ export const DomainApi = {
     ),
     groups: Query(
         Schema.object({
-            search: Schema.string(),
-            names: Schema.array(Schema.string()),
             domainId: Schema.string().required(),
+            uid: Schema.number().step(1),
+            names: Schema.array(Schema.string()),
+            search: Schema.string(),
+            limit: Schema.number().step(1).max(100),
         }),
         async (ctx, args) => {
             if (!ctx.user.hasPerm(PERM.PERM_VIEW) && !ctx.user.hasPriv(PRIV.PRIV_VIEW_ALL_DOMAIN)) throw new PermissionError(PERM.PERM_VIEW);
-            const groups = await user.listGroup(args.domainId);
-            if (args.names?.length) {
-                return groups.filter((g) => args.names.includes(g.name));
-            }
-            if (args.search) {
-                const searchLower = args.search.toLowerCase();
-                return groups.filter((g) => g.name.toLowerCase().includes(searchLower));
-            }
-            return groups;
+            return user.listGroup(args.domainId, args.uid, args.names, args.search, args.limit ?? 20);
         },
     ),
     'domain.group': Mutation(
diff --git a/packages/hydrooj/src/model/user.ts b/packages/hydrooj/src/model/user.ts
index 86d5d2aef..d112cb172 100644
--- a/packages/hydrooj/src/model/user.ts
+++ b/packages/hydrooj/src/model/user.ts
@@ -479,8 +479,16 @@ class UserModel {
         ]);
     }
 
-    static async listGroup(domainId: string, uid?: number) {
-        const groups = await collGroup.find(typeof uid === 'number' ? { domainId, uids: uid } : { domainId }).toArray();
+    static async listGroup(domainId: string, uid?: number, names?: string[], search?: string, limit?: number) {
+        const filter: Filter<GDoc> = { domainId };
+        if (typeof uid === 'number') filter.uids = uid;
+        const $and: Filter<GDoc>[] = [];
+        if (names?.length) $and.push({ name: { $in: names } });
+        if (search) $and.push({ name: { $regex: escapeRegExp(search), $options: 'i' } });
+        if ($and.length) filter.$and = $and;
+        let cursor = collGroup.find(filter);
+        if (limit) cursor = cursor.limit(limit);
+        const groups = await cursor.toArray();
         if (uid) {
             groups.push({
                 _id: new ObjectId(), domainId, uids: [uid], name: uid.toString(),