diff --git a/backend/src/books/books.repository.ts b/backend/src/books/books.repository.ts
index c06ac92d..8fb90b03 100644
--- a/backend/src/books/books.repository.ts
+++ b/backend/src/books/books.repository.ts
@@ -88,11 +88,7 @@ class BooksRepository extends Repository<Book> {
     sort: string,
     limit: number,
   ): Promise<LendingBookList[]> {
-    const orderingArr = [
-      { createdAt: 'DESC', title: 'ASC' },
-      { lendingCnt: 'DESC', title: 'ASC' },
-    ];
-    const ordering: any = sort === 'popular' ? orderingArr[1] : orderingArr[0];
+    const order = sort === 'popular' ? 'lendingCnt' : 'createdAt';
     const lendingCondition: string = sort === 'popular'
       ? 'and lending.createdAt >= date_sub(now(), interval 42 day)'
       : '';
@@ -119,7 +115,8 @@ class BooksRepository extends Repository<Book> {
       .leftJoin(Category, 'category', 'category.id = book_info.categoryId')
       .limit(limit)
       .groupBy('book_info.id')
-      .orderBy(ordering)
+      .orderBy(order, 'DESC')
+      .addOrderBy('title', 'ASC')
       .getRawMany<LendingBookList>();
     return lendingBookList;
   }
diff --git a/backend/src/reservations/reservations.repository.ts b/backend/src/reservations/reservations.repository.ts
index 9ca60219..e98617e5 100644
--- a/backend/src/reservations/reservations.repository.ts
+++ b/backend/src/reservations/reservations.repository.ts
@@ -51,7 +51,7 @@ class ReservationsRepository extends Repository<reservation> {
   }
 
   // 유저가 연체 중인지 확인
-  async isOverdueUser(userId: number) {
+  async isOverdueUser(userId: number): Promise<boolean> {
     return this.user
       .createQueryBuilder('u')
       .select('u.id')
@@ -106,6 +106,7 @@ class ReservationsRepository extends Repository<reservation> {
     return lenderableBookItemNum;
   }
 
+  // Todo: return 값 수정할 것
   async alreadyLendedBooks(userId: number, bookInfoId: number) {
     const lendedBooks = this.lending
       .createQueryBuilder('l')
@@ -117,6 +118,7 @@ class ReservationsRepository extends Repository<reservation> {
     return lendedBooks;
   }
 
+  // Todo: return 값 수정할 것
   async getReservedBooks(userId: number, bookInfoId: number) {
     const reservedBooks = this
       .createQueryBuilder('r')
@@ -127,7 +129,7 @@ class ReservationsRepository extends Repository<reservation> {
     return reservedBooks;
   }
 
-  async createReservation(userId: number, bookInfoId:number) {
+  async createReservation(userId: number, bookInfoId:number): Promise<void> {
     await this.createQueryBuilder()
       .insert()
       .into(reservation)
@@ -135,7 +137,7 @@ class ReservationsRepository extends Repository<reservation> {
       .execute();
   }
 
-  async searchReservations(query: string, filter: string, page: number, limit: number) {
+  async searchReservations(query: string, filter: string, page: number, limit: number): Promise<{ meta: Meta; items: reservation[] }> {
     const searchAll = this
       .createQueryBuilder('r')
       .select('r.id', 'reservationsId')
@@ -173,7 +175,7 @@ class ReservationsRepository extends Repository<reservation> {
       default:
         searchAll.andWhere({ status: 0, bookId: IsNull() });
     }
-    const items = await searchAll.offset(limit * page).limit(limit).getRawMany();
+    const items = await searchAll.offset(limit * page).limit(limit).getRawMany<reservation>();
     const totalItems = await searchAll.getCount();
     const meta : Meta = {
       totalItems,
diff --git a/backend/src/reviews/repository/reviews.repository.ts b/backend/src/reviews/repository/reviews.repository.ts
index 2b1df603..636f854e 100644
--- a/backend/src/reviews/repository/reviews.repository.ts
+++ b/backend/src/reviews/repository/reviews.repository.ts
@@ -42,7 +42,7 @@ export default class ReviewsRepository extends Repository<Reviews> {
     page: number,
     sort: 'ASC' | 'DESC' | undefined,
     limit: number,
-  ) {
+  ): Promise<Reviews[]> {
     const reviews = this.createQueryBuilder('reviews')
       .select('reviews.id', 'reviewsId')
       .addSelect('reviews.userId', 'reviewerId')
@@ -67,7 +67,7 @@ export default class ReviewsRepository extends Repository<Reviews> {
     }
     const ret = await reviews.offset(page * limit)
       .limit(limit)
-      .getRawMany();
+      .getRawMany<Reviews>();
     return ret;
   }