diff --git a/src/laana/action/group.ts b/src/laana/action/group.ts
new file mode 100644
index 00000000..b7543973
--- /dev/null
+++ b/src/laana/action/group.ts
@@ -0,0 +1,165 @@
+import { GroupMemberRole, NapCatCore, Sex } from '@/core';
+import { NapCatLaanaAdapter } from '@/laana';
+import {
+    LaanaUserEntity,
+    LaanaUserEntity_Sex,
+    LaanaUserEntity_GroupRoleData_PermissionLevel as PermLevel,
+    LaanaFile,
+    SetGroupAdminPing_Operation,
+} from '@laana-proto/def';
+
+export class LaanaGroupActionImpl {
+    constructor(
+        public core: NapCatCore,
+        public laana: NapCatLaanaAdapter,
+    ) {}
+
+    async getGroupMemberUins(groupCode: string) {
+        return Array.from((await this.core.apis.GroupApi.getGroupMembersV2(groupCode)).values())
+            .map(value => value.uin);
+    }
+
+    async getGroupMemberInfo(groupCode: string, uin: string): Promise<LaanaUserEntity> {
+        const uid = await this.core.apis.UserApi.getUidByUinV2(uin);
+        if (!uid) {
+            throw new Error(`获取 ${uin} 信息失败`);
+        }
+        const userInfo = await this.core.apis.GroupApi.getGroupMember(groupCode, uid);
+        if (!userInfo) {
+            throw new Error(`获取 ${uin} 信息失败`);
+        }
+        return {
+            uin,
+            nick: userInfo.nick,
+            sex: userInfo.sex === Sex.male ? LaanaUserEntity_Sex.MALE
+                : userInfo.sex === Sex.female ? LaanaUserEntity_Sex.FEMALE
+                    : LaanaUserEntity_Sex.UNKNOWN,
+            age: userInfo.age,
+            qid: userInfo.qid,
+            roleData: {
+                oneofKind: 'groupRoleData',
+                groupRoleData: {
+                    groupNick: userInfo.cardName || undefined,
+                    permissionLevel: userInfo.role === GroupMemberRole.normal ? PermLevel.NORMAL :
+                        userInfo.role === GroupMemberRole.admin ? PermLevel.ADMIN :
+                            userInfo.role === GroupMemberRole.owner ? PermLevel.OWNER :
+                                PermLevel.FALLBACK,
+                    isRobot: userInfo.isRobot,
+                    lastSpeakTime: BigInt(userInfo.lastSpeakTime), // TODO: multiple by 1000?
+                    shutUpTime: BigInt(userInfo.shutUpTime), // TODO: multiple by 1000?
+                }
+            }
+        };
+    }
+
+    /**
+     * Get group info.
+     * @param groupCode Group code.
+     * @param newGroupName New group name.
+     */
+    async setGroupName(groupCode: string, newGroupName: string) {
+        return await this.core.apis.GroupApi.setGroupName(groupCode, newGroupName);
+    }
+
+    /**
+     * Set group avatar.
+     * @param groupCode Group code.
+     * @param newAvatarFile Laana-styled file.
+     * @returns Cache ID of the new avatar.
+     */
+    async setGroupAvatar(groupCode: string, newAvatarFile: LaanaFile) {
+        const cacheId = await this.laana.utils.file.resolveCacheIdFromLaanaFile(newAvatarFile);
+        const path = await this.laana.utils.file.toLocalPath(cacheId);
+        await this.core.apis.GroupApi.setGroupAvatar(groupCode, path);
+        return cacheId;
+    }
+
+    /**
+     * Set group admin.
+     * @param groupCode Group code.
+     * @param uin Uin of the member.
+     * @param operation Set or unset.
+     */
+    async setGroupAdmin(groupCode: string, uin: string, operation: SetGroupAdminPing_Operation) {
+        const uid = await this.core.apis.UserApi.getUidByUinV2(uin);
+        if (!uid) {
+            throw new Error(`获取 ${uin} 对应 ${uid} 失败`);
+        }
+        return await this.core.apis.GroupApi.setMemberRole(
+            groupCode,
+            uid,
+            operation === SetGroupAdminPing_Operation.SET ? GroupMemberRole.admin : GroupMemberRole.normal
+        );
+    }
+
+    /**
+     * Set group member card name.
+     * @param groupCode Group code.
+     * @param uin Uin of the member.
+     * @param newCardName New card name.
+     */
+    async setGroupMemberCardName(groupCode: string, uin: string, newCardName: string) {
+        const uid = await this.core.apis.UserApi.getUidByUinV2(uin);
+        if (!uid) {
+            throw new Error(`获取 ${uin} 对应 ${uid} 失败`);
+        }
+        return await this.core.apis.GroupApi.setMemberCard(groupCode, uid, newCardName);
+    }
+
+    /**
+     * Shut up a group member.
+     * @param groupCode Group code.
+     * @param uin Uin of the member.
+     * @param duration Duration of the shut-up.
+     */
+    async setGroupMemberShutUp(groupCode: string, uin: string, duration: number) {
+        const uid = await this.core.apis.UserApi.getUidByUinV2(uin);
+        if (!uid) {
+            throw new Error(`获取 ${uin} 对应 ${uid} 失败`);
+        }
+        return await this.core.apis.GroupApi.banMember(groupCode, [{ uid, timeStamp: duration }]);
+    }
+
+    /**
+     * Lift a group member's shut-up.
+     * @param groupCode Group code.
+     * @param uin Uin of the member.
+     */
+    async liftGroupMemberShutUp(groupCode: string, uin: string) {
+        const uid = await this.core.apis.UserApi.getUidByUinV2(uin);
+        if (!uid) {
+            throw new Error(`获取 ${uin} 对应 ${uid} 失败`);
+        }
+        return await this.core.apis.GroupApi.banMember(groupCode, [{ uid, timeStamp: 0 }]);
+    }
+
+    /**
+     * Set group shut-up all.
+     * @param groupCode Group code.
+     * @param lift Lift or set.
+     */
+    async setGroupShutUpAll(groupCode: string, lift: boolean) {
+        return await this.core.apis.GroupApi.banGroup(groupCode, !lift);
+    }
+
+    /**
+     * Kick a group member.
+     * @param groupCode Group code.
+     * @param uin Uin of the member.
+     */
+    async kickGroupMember(groupCode: string, uin: string) {
+        const uid = await this.core.apis.UserApi.getUidByUinV2(uin);
+        if (!uid) {
+            throw new Error(`获取 ${uin} 对应 ${uid} 失败`);
+        }
+        return await this.core.apis.GroupApi.kickMember(groupCode, [uid]);
+    }
+
+    /**
+     * Quit a group.
+     * @param groupCode Group code.
+     */
+    async quitGroup(groupCode: string) {
+        return await this.core.apis.GroupApi.quitGroup(groupCode);
+    }
+}