diff --git a/src/modules/database/base/service.ts b/src/modules/database/base/service.ts
new file mode 100644
index 0000000..09328a5
--- /dev/null
+++ b/src/modules/database/base/service.ts
@@ -0,0 +1,130 @@
+import { NotFoundException } from '@nestjs/common';
+import { isNil } from 'lodash';
+import { In, ObjectLiteral, SelectQueryBuilder } from 'typeorm';
+
+import { BaseRepository } from '@/modules/database/base/repository';
+import { BaseTreeRepository } from '@/modules/database/base/tree.repository';
+import { SelectTrashMode, TreeChildrenResolve } from '@/modules/database/constants';
+import {
+    PaginateOptions,
+    PaginateReturn,
+    QueryHook,
+    ServiceListQueryOption,
+} from '@/modules/database/types';
+import { paginate, treePaginate } from '@/modules/database/utils';
+
+export abstract class BaseService<
+    T extends ObjectLiteral,
+    R extends BaseRepository<T> | BaseTreeRepository<T>,
+    P extends ServiceListQueryOption<T> = ServiceListQueryOption<T>,
+> {
+    protected repository: R;
+
+    protected enableTrash = false;
+
+    protected constructor(repository: R) {
+        this.repository = repository;
+        if (
+            !(
+                this.repository instanceof BaseRepository ||
+                this.repository instanceof BaseTreeRepository
+            )
+        ) {
+            throw new Error('Repository init error.');
+        }
+    }
+
+    protected async buildItemQB(id: string, qb: SelectQueryBuilder<T>, callback?: QueryHook<T>) {
+        qb.where(`${this.repository.qbName}.id = :id`, { id });
+        if (callback) {
+            return callback(qb);
+        }
+        return qb;
+    }
+
+    protected async buildListQB(qb: SelectQueryBuilder<T>, options?: P, callback?: QueryHook<T>) {
+        const { trashed } = options ?? {};
+        const queryName = this.repository.qbName;
+        if (this.enableTrash && trashed in [SelectTrashMode.ALL, SelectTrashMode.ONLY]) {
+            qb.withDeleted();
+            if (trashed === SelectTrashMode.ONLY) {
+                qb.where(`${queryName}.deletedAt IS NOT NULL`);
+            }
+        }
+        if (callback) {
+            return callback(qb);
+        }
+        return qb;
+    }
+
+    async list(options?: P, callback?: QueryHook<T>) {
+        const { trashed: isTrashed = false } = options ?? {};
+        const trashed = isTrashed || SelectTrashMode.NONE;
+        if (this.repository instanceof BaseTreeRepository) {
+            const withTrashed =
+                this.enableTrash && trashed in [SelectTrashMode.ALL, SelectTrashMode.ONLY];
+            const onlyTrashed = this.enableTrash && trashed === SelectTrashMode.ONLY;
+            const tree = await this.repository.findTrees({ ...options, withTrashed, onlyTrashed });
+            return this.repository.toFlatTrees(tree);
+        }
+        const qb = await this.buildListQB(this.repository.buildBaseQB(), options, callback);
+        return qb.getMany();
+    }
+
+    async paginate(options?: PaginateOptions & P, callback?: QueryHook<T>) {
+        const queryOptions = (options ?? {}) as P;
+        if (this.repository instanceof BaseTreeRepository) {
+            const data = await this.list(queryOptions, callback);
+            return treePaginate(options, data) as PaginateReturn<T>;
+        }
+        const qb = await this.buildListQB(this.repository.buildBaseQB(), queryOptions, callback);
+        return paginate(qb, options);
+    }
+
+    async detail(id: string, callback?: QueryHook<T>) {
+        const qb = await this.buildItemQB(id, this.repository.buildBaseQB(), callback);
+        const item = qb.getOne();
+        if (!item) {
+            throw new NotFoundException(`${this.repository.qbName} ${id} NOT FOUND`);
+        }
+        return item;
+    }
+
+    async delete(ids: string[], trash?: boolean) {
+        let items: T[];
+        if (this.repository instanceof BaseTreeRepository) {
+            items = await this.repository.find({
+                where: { id: In(ids) as any },
+                withDeleted: this.enableTrash ? true : undefined,
+                relations: ['parent', 'children'],
+            });
+            if (this.repository.childrenResolve === TreeChildrenResolve.UP) {
+                for (const item of items) {
+                    if (isNil(item.children) || item.children.length <= 0) {
+                        continue;
+                    }
+                    const children = [...item.children].map((o) => {
+                        o.parent = item.parent;
+                        return item;
+                    });
+                    await this.repository.save(children);
+                }
+            }
+        } else {
+            items = await this.repository.find({
+                where: { id: In(ids) as any },
+                withDeleted: this.enableTrash ? true : undefined,
+            });
+        }
+
+        if (this.enableTrash && trash) {
+            const directs = items.filter((item) => !isNil(item.deletedAt));
+            const softs = items.filter((item) => isNil(item.deletedAt));
+            return [
+                ...(await this.repository.remove(directs)),
+                ...(await this.repository.softRemove(softs)),
+            ];
+        }
+        return this.repository.remove(items);
+    }
+}
diff --git a/src/modules/database/types.ts b/src/modules/database/types.ts
index 7500941..36f6aef 100644
--- a/src/modules/database/types.ts
+++ b/src/modules/database/types.ts
@@ -1,6 +1,6 @@
-import { ObjectLiteral, SelectQueryBuilder } from 'typeorm';
+import { FindTreeOptions, ObjectLiteral, SelectQueryBuilder } from 'typeorm';
 
-import { OrderType } from '@/modules/database/constants';
+import { OrderType, SelectTrashMode } from '@/modules/database/constants';
 
 export type QueryHook<Entity> = (
     qb: SelectQueryBuilder<Entity>,
@@ -38,3 +38,17 @@ export interface QueryParams<T extends ObjectLiteral> {
 
     onlyTrashed?: boolean;
 }
+
+export type ServiceListQueryOptionWithTrashed<T extends ObjectLiteral> = Omit<
+    FindTreeOptions & QueryParams<T>,
+    'withTrashed'
+> & { trashed?: `${SelectTrashMode}` } & RecordAny;
+
+export type ServiceListQueryOptionNotWithTrashed<T extends ObjectLiteral> = Omit<
+    ServiceListQueryOptionWithTrashed<T>,
+    'trashed'
+>;
+
+export type ServiceListQueryOption<T extends ObjectLiteral> =
+    | ServiceListQueryOptionNotWithTrashed<T>
+    | ServiceListQueryOptionWithTrashed<T>;