diff --git a/src/modules/products/dto/create-product.dto.ts b/src/modules/products/dto/create-product.dto.ts
index 5397e47..ac92a1c 100644
--- a/src/modules/products/dto/create-product.dto.ts
+++ b/src/modules/products/dto/create-product.dto.ts
@@ -1,3 +1,21 @@
-import { ProductEntity } from '../entities/product.entity';
+import { IsInt, IsString, IsOptional, Min, IsNumber } from 'class-validator';
 
-export class CreateProductDto extends ProductEntity {}
+export class CreateProductDto {
+
+  @IsInt()
+  sellerId: number; // 사용자는 판매자의 ID만 제공합니다. 연관된 엔터티는 서비스 레벨에서 처리됩니다.
+
+  @IsString()
+  name: string;
+
+  @IsString()
+  price: string;
+
+  @IsNumber()
+  @Min(0)
+  quantity: number;
+
+  @IsString()
+  @IsOptional() // 선택적 필드입니다.
+  description?: string;
+}
\ No newline at end of file
diff --git a/src/modules/products/entities/product.entity.ts b/src/modules/products/entities/product.entity.ts
index 5af4f20..5aea718 100644
--- a/src/modules/products/entities/product.entity.ts
+++ b/src/modules/products/entities/product.entity.ts
@@ -1,8 +1,28 @@
 import { CommonColumns } from '@/common/entities/common-columns';
-import { Column, Entity } from 'typeorm';
+import { UserEntity } from '@/modules/users/entities/user.entity';
+import { Column, PrimaryGeneratedColumn, ManyToMany, JoinTable, ManyToOne, JoinColumn, Entity } from 'typeorm';
 
 @Entity({ name: 'products' })
 export class ProductEntity extends CommonColumns {
+  
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @ManyToOne(() => UserEntity, seller => seller.products)
+  @JoinColumn({ name: 'seller_id' })  // This sets up the foreign key
+  seller: UserEntity;
+
   @Column()
   name: string;
+
+  @Column()
+  price: string;
+
+  @Column()
+  quantity: number;
+
+  @Column({ nullable: true })
+  description?: string;
+
+
 }
diff --git a/src/modules/products/products.service.spec.ts b/src/modules/products/products.service.spec.ts
index 6e88ec5..c27b43b 100644
--- a/src/modules/products/products.service.spec.ts
+++ b/src/modules/products/products.service.spec.ts
@@ -30,8 +30,52 @@ describe('ProductsService', () => {
 
     service = module.get<ProductsService>(ProductsService);
   });
+  //post 하기 전 유효성 검사(통과케이스)
+  it('should validate product upload and return true', async() => {
+    const ProductInfo =  {id: 1, name: 'Sample Product', price: 100}
+    mockRepo.create.mockResolvedValue(storedProductInfo);
 
-  it('should be defined', () => {
-    expect(service).toBeDefined();
+    const isValid = await service.add_product_validation(storedProductInfo)
+    expect(isValid).toBe(true);
   });
+  //post 유효성검사 : 제품 이름이 빈 문자열이면 validation Error
+  it('should throw an error if product name is empty', async() => {
+    const productWithEmptyName = { name: '', price: 100 };
+    const storedProductInfo = { id: 1, ...productWithEmptyName };
+    mockRepo.create.mockResolvedValue(storedProductInfo);
+
+    await expect(service.add_product_validation(storedProductInfo)).rejects.toThrow('Validation Error: Product name is required.');
+});
+  // post 유효성검사 : 가격이 음수면 validation Error
+  it('should throw an error if product price is minus', async() => {
+    const productWithMinusPrice = {name: 'Sample Product', price: -1};
+    const storedProductInfo = {id :1, ...productWithMinusPrice}
+    mockRepo.create.mockResolvedValue(storedProductInfo);
+
+    await expect(service.add_product_validation(storedProductInfo)).rejects.toThrow('Validation Error:product price is minus');
+  });
+  // post 유효성검사 : 가격이 정수가 아니면 validation Error
+  it('should throw an error if product price is not a natural number', async() => {
+    const productWithDecimalPrice = {name: 'Sample Product', price: 100.5};
+    const storedProductInfo = {id :1, ...productWithDecimalPrice}
+    mockRepo.create.mockResolvedValue(storedProductInfo);
+
+    await expect(service.add_product_validation(storedProductInfo)).rejects.toThrow('Validation Error:product price is not natural number');
+  });
+  // post 유효성검사 : description 멘트가 너무 길면 validation Error
+  it('should throw an error if product description is too long', async() => {
+    const longDescription = 'a'.repeat(1001); // 1000자 이상이면 에러라고 가정
+    const productWithLongDescription = { name: 'Sample Product', price: 100, description: longDescription };
+    const storedProductInfo = { id: 1, ...productWithLongDescription };
+    mockRepo.create.mockResolvedValue(storedProductInfo);
+
+    await expect(service.add_product_validation(storedProductInfo)).rejects.toThrow('Validation Error: Product description is too long.');
+});
+  // post 유효성검사: 카테고리가 실제로 데이터베이스 내에 존재하지 않을때 에러 발생
+  it('should throw an error if product category does not exist', async() => {
+    const productWithNonExistingCategory = { name: 'Sample Product', price: 100, category: 'UnknownCategory' };
+    mockRepo.create.mockResolvedValue(productWithNonExistingCategory);
+
+    await expect(service.add_product_validation(productWithNonExistingCategory)).rejects.toThrow('Validation Error: Provided category does not exist.');
+});  
 });
diff --git a/src/modules/products/products.service.ts b/src/modules/products/products.service.ts
index 8aa1132..6c9dc73 100644
--- a/src/modules/products/products.service.ts
+++ b/src/modules/products/products.service.ts
@@ -35,8 +35,8 @@ export class ProductsService {
     return [newSomething, newOtherThing];
   }
 
-  private some_validation_post() {
-    return true;
+  private product_add_validation() {
+    return false;
   }
 
   private some_validation_comment() {
@@ -47,6 +47,16 @@ export class ProductsService {
    * 트랜젝션이 사용 될 때, 우리가 주로 사용하기로 한 방식
    */
   create_with_component(createProductDto: CreateProductDto) {
+
+    // 1. 어떤 로직으로 게시글을 작성하고 검증한다
+    this.some_validation_post();
+    // 2. 다른 로직으로 댓글을 작성하고 검증한다.
+    this.some_validation_comment();
+    return this.comp.createSomethingAndOther(createProductDto);
+  }
+  
+  create_with_component(createProductDto: CreateProductDto) {
+    
     // 1. 어떤 로직으로 게시글을 작성하고 검증한다
     this.some_validation_post();
     // 2. 다른 로직으로 댓글을 작성하고 검증한다.