diff --git a/src/APIs/announcements/__test__/announcements.service.spec.ts b/src/APIs/announcements/__test__/announcements.service.spec.ts
index a3fa099..a5ff1e4 100644
--- a/src/APIs/announcements/__test__/announcements.service.spec.ts
+++ b/src/APIs/announcements/__test__/announcements.service.spec.ts
@@ -1,10 +1,35 @@
-import { MockRepository } from '@/utils/test.utils';
+import {
+  MockRepository,
+  MockRepositoryFactory,
+  MockService,
+  MockServiceFactory,
+  TEST_DATE_FIELDS,
+} from '@/utils/test.utils';
 import { AnnouncementsService } from '../announcements.service';
+import { AnnouncementsRepository } from '../announcements.repository';
+import { AnnouncementDto } from '../dtos/common/announcement.dto';
+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+import { UsersValidateService } from '@/APIs/users/services/users-validate-service';
+import {
+  IAnnouncementsServiceCreateAnnouncement,
+  IAnnouncementsServiceId,
+  IAnnouncementsServicePatchAnnouncement,
+} from '../interfaces/announcements.service.interface';
+import { UserDto } from '@/APIs/users/dtos/common/user.dto';
+import {
+  BlccuExceptionTest,
+  BlccuHttpException,
+} from '@/common/blccu-exception';
 
 describe('AnnouncementsService', () => {
-  let svc_agreements: AnnouncementsService;
-  let repo_agreements: MockRepository<AnnouncementsRepository>;
-  let dto_agreement: AgreementDto;
+  let svc_announcements: AnnouncementsService;
+  let repo_announcements: MockRepository<AnnouncementsRepository>;
+  let svc_usersValidate: MockService<UsersValidateService>;
+
+  let dto_announcement: AnnouncementDto;
+  let dto_user: UserDto;
+  let dto_adminUser: UserDto;
 
   beforeEach(async () => {
     const module: TestingModule = await Test.createTestingModule({
@@ -16,25 +41,234 @@ describe('AnnouncementsService', () => {
             AnnouncementsRepository,
           ),
         },
-
-        UsersValidateService,
         {
-          provide: getRepositoryToken(UsersRepository),
-          useValue: MockRepositoryFactory.getMockRepository(UsersRepository),
+          provide: UsersValidateService,
+          useValue: MockServiceFactory.getMockService(UsersValidateService),
         },
       ],
     }).compile();
 
-    svc_agreements = module.get<AnnouncementsService>(AnnouncementsService);
-    repo_agreements = module.get<MockRepository<AnnouncementsRepository>>(
+    svc_announcements = module.get<AnnouncementsService>(AnnouncementsService);
+    repo_announcements = module.get<MockRepository<AnnouncementsRepository>>(
       getRepositoryToken(AnnouncementsRepository),
     );
-    dto_agreement = {
+    svc_usersValidate =
+      module.get<MockService<UsersValidateService>>(UsersValidateService);
+    dto_announcement = {
       id: 1,
-      userId: 1,
-      agreementType: AgreementType.TERMS_OF_SERVICE,
-      isAgreed: true,
+      title: '공지사항',
+      content: '공지내용',
       ...TEST_DATE_FIELDS,
     };
+    dto_user = {
+      id: 1,
+      isAdmin: false,
+      handle: 'user',
+      username: '유저',
+      followerCount: 0,
+      followingCount: 0,
+      description: '소개',
+      profileImage: '',
+      backgroundImage: '',
+      ...TEST_DATE_FIELDS,
+    };
+    dto_adminUser = { ...dto_user, isAdmin: true };
+  });
+
+  describe('createAnnoucement', () => {
+    const createAnnoucementInput: IAnnouncementsServiceCreateAnnouncement = {
+      userId: 1,
+      title: '공지사항',
+      content: '공지내용',
+    };
+
+    it('should return AnnouncementDto with valid input', async () => {
+      repo_announcements.save.mockResolvedValue(dto_announcement);
+      svc_usersValidate.adminCheck.mockResolvedValue(dto_adminUser);
+      const result = await svc_announcements.createAnnoucement(
+        createAnnoucementInput,
+      );
+      expect(result).toEqual(dto_announcement);
+      expect(repo_announcements.save).toHaveBeenCalledWith({
+        title: createAnnoucementInput.title,
+        content: createAnnoucementInput.content,
+      });
+    });
+
+    it('should throw exception for invalid userId', async () => {
+      repo_announcements.save.mockResolvedValue(dto_announcement);
+      svc_usersValidate.adminCheck.mockRejectedValue(
+        new BlccuHttpException('USER_NOT_FOUND'),
+      );
+
+      expect(
+        svc_announcements.createAnnoucement(createAnnoucementInput),
+      ).rejects.toThrow(BlccuExceptionTest('USER_NOT_FOUND'));
+      expect(repo_announcements.save).not.toHaveBeenCalled();
+    });
+
+    it('should throw exception for non-admin user', async () => {
+      repo_announcements.save.mockResolvedValue(dto_announcement);
+      svc_usersValidate.adminCheck.mockRejectedValue(
+        new BlccuHttpException('NOT_AN_ADMIN'),
+      );
+
+      expect(
+        svc_announcements.createAnnoucement(createAnnoucementInput),
+      ).rejects.toThrow(BlccuExceptionTest('NOT_AN_ADMIN'));
+      expect(repo_announcements.save).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('existCheck', () => {
+    it('should throw exception when announcement does not exist', async () => {
+      const existCheckInput: IAnnouncementsServiceId = { announcementId: 1 };
+      const findOneOutput: AnnouncementDto = null;
+      repo_announcements.findOne.mockResolvedValue(findOneOutput);
+      await expect(
+        svc_announcements.existCheck(existCheckInput),
+      ).rejects.toThrow(BlccuExceptionTest('ANNOUNCEMENT_NOT_FOUND'));
+      expect(repo_announcements.findOne).toHaveBeenCalledWith({
+        where: { id: existCheckInput.announcementId },
+      });
+    });
+
+    it('should return AnnouncementDto when announcement exists', async () => {
+      const existCheckInput: IAnnouncementsServiceId = { announcementId: 1 };
+      repo_announcements.findOne.mockResolvedValue(dto_announcement);
+      expect(svc_announcements.existCheck(existCheckInput)).resolves.toEqual(
+        dto_announcement,
+      );
+      expect(repo_announcements.findOne).toHaveBeenCalledWith({
+        where: { id: existCheckInput.announcementId },
+      });
+    });
+
+    describe('patchAnnouncement', () => {
+      const patchAnnouncementInput: IAnnouncementsServicePatchAnnouncement = {
+        userId: 1,
+        announcementId: 1,
+        title: '수정된 제목',
+        content: '수정된 내용',
+      };
+
+      it('should return AnnouncementDto with valid input', async () => {
+        const patchAnnouncementOutput = {
+          ...dto_announcement,
+          title: patchAnnouncementInput.title,
+          content: patchAnnouncementInput.content,
+        };
+        jest
+          .spyOn(svc_announcements, 'existCheck')
+          .mockResolvedValue(dto_announcement);
+        svc_usersValidate.adminCheck.mockResolvedValue(dto_adminUser);
+
+        repo_announcements.save.mockResolvedValue(patchAnnouncementOutput);
+        repo_announcements.findOne.mockResolvedValue(patchAnnouncementOutput);
+
+        await expect(
+          svc_announcements.patchAnnouncement(patchAnnouncementInput),
+        ).resolves.toEqual(patchAnnouncementOutput);
+
+        expect(repo_announcements.findOne).toHaveBeenCalledWith({
+          where: { id: patchAnnouncementInput.announcementId },
+        });
+        expect(repo_announcements.save).toHaveBeenCalledWith(
+          patchAnnouncementOutput,
+        );
+      });
+
+      it('should throw exception for invalid userId', async () => {
+        const patchAnnouncementOutput = {
+          ...dto_announcement,
+          title: patchAnnouncementInput.title,
+          content: patchAnnouncementInput.content,
+        };
+        repo_announcements.save.mockResolvedValue(patchAnnouncementOutput);
+        repo_announcements.findOne.mockResolvedValue(patchAnnouncementOutput);
+        svc_usersValidate.adminCheck.mockRejectedValue(
+          new BlccuHttpException('USER_NOT_FOUND'),
+        );
+        jest
+          .spyOn(svc_announcements, 'existCheck')
+          .mockResolvedValue(dto_announcement);
+        await expect(
+          svc_announcements.patchAnnouncement(patchAnnouncementInput),
+        ).rejects.toThrow(BlccuExceptionTest('USER_NOT_FOUND'));
+        expect(svc_announcements.existCheck).not.toHaveBeenCalled();
+        expect(repo_announcements.save).not.toHaveBeenCalled();
+        expect(repo_announcements.findOne).not.toHaveBeenCalled();
+      });
+
+      it('should throw exception for non-admin user', async () => {
+        const patchAnnouncementOutput = {
+          ...dto_announcement,
+          title: patchAnnouncementInput.title,
+          content: patchAnnouncementInput.content,
+        };
+        repo_announcements.save.mockResolvedValue(patchAnnouncementOutput);
+        repo_announcements.findOne.mockResolvedValue(patchAnnouncementOutput);
+        svc_usersValidate.adminCheck.mockRejectedValue(
+          new BlccuHttpException('NOT_AN_ADMIN'),
+        );
+        jest
+          .spyOn(svc_announcements, 'existCheck')
+          .mockResolvedValue(dto_announcement);
+        await expect(
+          svc_announcements.patchAnnouncement(patchAnnouncementInput),
+        ).rejects.toThrow(BlccuExceptionTest('NOT_AN_ADMIN'));
+        expect(svc_announcements.existCheck).not.toHaveBeenCalled();
+        expect(repo_announcements.save).not.toHaveBeenCalled();
+        expect(repo_announcements.findOne).not.toHaveBeenCalled();
+      });
+
+      it('should throw exception for invalid announcementId', async () => {
+        const patchAnnouncementOutput = {
+          ...dto_announcement,
+          title: patchAnnouncementInput.title,
+          content: patchAnnouncementInput.content,
+        };
+        repo_announcements.save.mockResolvedValue(patchAnnouncementOutput);
+        repo_announcements.findOne.mockResolvedValue(patchAnnouncementOutput);
+        svc_usersValidate.adminCheck.mockResolvedValue(dto_adminUser);
+        svc_announcements.existCheck = jest.fn();
+        jest
+          .spyOn(svc_announcements, 'existCheck')
+          .mockRejectedValue(new BlccuHttpException('ANNOUNCEMENT_NOT_FOUND'));
+
+        await expect(
+          svc_announcements.patchAnnouncement(patchAnnouncementInput),
+        ).rejects.toThrow(BlccuExceptionTest('ANNOUNCEMENT_NOT_FOUND'));
+
+        expect(repo_announcements.save).not.toHaveBeenCalled();
+        expect(repo_announcements.findOne).not.toHaveBeenCalled();
+      });
+    });
+    describe('removeAnnouncement', () => {
+      it('should return AgreementDto with valid input', async () => {
+        //arrange
+        jest
+          .spyOn(svc_announcements, 'existCheck')
+          .mockResolvedValue(dto_announcement);
+        svc_usersValidate.adminCheck.mockResolvedValue(dto_adminUser);
+        repo_announcements.softRemove.mockResolvedValue(dto_announcement);
+        //act
+        const result = await svc_announcements.removeAnnouncement({
+          userId: dto_adminUser.id,
+          announcementId: dto_announcement.id,
+        });
+        //assert
+        expect(result).toEqual(dto_announcement);
+        expect(svc_usersValidate.adminCheck).toHaveBeenCalledWith({
+          userId: dto_adminUser.id,
+        });
+        expect(svc_announcements.existCheck).toHaveBeenCalledWith({
+          announcementId: dto_announcement.id,
+        });
+        expect(repo_announcements.softRemove).toHaveBeenCalledWith(
+          dto_announcement,
+        );
+      });
+    });
   });
 });
diff --git a/src/APIs/announcements/announcements.service.ts b/src/APIs/announcements/announcements.service.ts
index a914785..cfe1df7 100644
--- a/src/APIs/announcements/announcements.service.ts
+++ b/src/APIs/announcements/announcements.service.ts
@@ -1,7 +1,4 @@
 import { Injectable } from '@nestjs/common';
-import { InjectRepository } from '@nestjs/typeorm';
-import { Announcement } from './entities/announcement.entity';
-import { Repository } from 'typeorm';
 import {
   IAnnouncementsServiceCreateAnnouncement,
   IAnnouncementsServiceId,