diff --git a/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/product/service/ProductService.java b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/product/service/ProductService.java
index b282396..197cfb3 100644
--- a/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/product/service/ProductService.java
+++ b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/product/service/ProductService.java
@@ -6,6 +6,7 @@
 import com.example.mutbooks.app.product.entity.Product;
 import com.example.mutbooks.app.product.form.ProductForm;
 import com.example.mutbooks.app.product.repository.ProductRepository;
+import com.example.mutbooks.app.productHashTag.service.ProductHashTagService;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -16,6 +17,7 @@
 public class ProductService {
     private final ProductRepository productRepository;
     private final PostKeywordService postKeywordService;
+    private final ProductHashTagService productHashTagService;
 
     @Transactional
     public Product create(Member author, ProductForm productForm) {
@@ -31,7 +33,11 @@ public Product create(Member author, ProductForm productForm) {
 
         productRepository.save(product);
 
-        // TODO : 도서 해시태그 저장
+        // 도서 해시태그 적용
+        String productKeywords = productForm.getProductKeywords();
+        if(productKeywords != null) {
+            productHashTagService.apply(product, productKeywords);
+        }
 
         return product;
     }
diff --git a/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productHashTag/repository/ProductHashTagRepository.java b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productHashTag/repository/ProductHashTagRepository.java
new file mode 100644
index 0000000..177afea
--- /dev/null
+++ b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productHashTag/repository/ProductHashTagRepository.java
@@ -0,0 +1,13 @@
+package com.example.mutbooks.app.productHashTag.repository;
+
+import com.example.mutbooks.app.productHashTag.entity.ProductHashTag;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface ProductHashTagRepository extends JpaRepository<ProductHashTag, Long> {
+    List<ProductHashTag> findByProductId(Long productId);
+
+    Optional<ProductHashTag> findByProductIdAndProductKeywordId(Long productId, Long productKeywordId);
+}
diff --git a/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productHashTag/service/ProductHashTagService.java b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productHashTag/service/ProductHashTagService.java
new file mode 100644
index 0000000..9c317e2
--- /dev/null
+++ b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productHashTag/service/ProductHashTagService.java
@@ -0,0 +1,84 @@
+package com.example.mutbooks.app.productHashTag.service;
+
+import com.example.mutbooks.app.product.entity.Product;
+import com.example.mutbooks.app.productHashTag.entity.ProductHashTag;
+import com.example.mutbooks.app.productHashTag.repository.ProductHashTagRepository;
+import com.example.mutbooks.app.productKeyword.entity.ProductKeyword;
+import com.example.mutbooks.app.productKeyword.service.ProductKeywordService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class ProductHashTagService {
+    private final ProductHashTagRepository productHashTagRepository;
+    private final ProductKeywordService productKeywordService;
+
+    // 도서(상품)에 해시태그 반영
+    @Transactional
+    public void apply(Product product, String productKeywords) {
+        // 1. 기존 해시태그 가져오기
+        List<ProductHashTag> oldHashTags = findByProductId(product.getId());
+
+        // 2. 새로운 해시태그 키워드 리스트
+        List<String> keywordContents = Arrays.stream(productKeywords.split("#"))
+                .map(String::trim)
+                .filter(s -> s.length() > 0)
+                .collect(Collectors.toList());
+
+        // 3. 삭제할 해시태그 구하기(기존 해시태그 리스트에서 새로운 해시태그 리스트에 없는 것)
+        List<ProductHashTag> deleteHashTags = new ArrayList<>();
+        for(ProductHashTag oldHashTag : oldHashTags) {
+            // 기존에 등록된 해시태그가 새롭게 등록된 해시태그에 포함되었는지 여부
+            boolean contains = keywordContents.stream().anyMatch(s -> s.equals(oldHashTag.getProductKeyword().getContent()));
+
+            if(!contains) {
+                deleteHashTags.add(oldHashTag);
+            }
+        }
+
+        // 4. 3번에서 구한 해시태그 삭제
+        deleteHashTags.forEach(hashTag -> {
+            productHashTagRepository.delete(hashTag);
+        });
+
+        // 5. 나머지 해시태그는 저장
+        keywordContents.forEach(keywordContent -> {
+            save(product, keywordContent);
+        });
+    }
+
+    // 도서 해시태그 저장
+    public ProductHashTag save(Product product, String keywordContent) {
+        // 1. keyword 가져오기
+        ProductKeyword productKeyword = productKeywordService.save(keywordContent);
+
+        // 2. (productId + keywordId) 가 DB에 있으면 바로 리턴
+        ProductHashTag productHashTag = productHashTagRepository.findByProductIdAndProductKeywordId(product.getId(), productKeyword.getId()).orElse(null);
+        if(productHashTag != null) {
+            return productHashTag;
+        }
+
+        // 3. (productId + keywordId) 로 DB에 없으면 productHashTag 저장
+        productHashTag = ProductHashTag.builder()
+                .member(product.getAuthor())
+                .product(product)
+                .productKeyword(productKeyword)
+                .build();
+
+        productHashTagRepository.save(productHashTag);
+
+        return productHashTag;
+    }
+
+    private List<ProductHashTag> findByProductId(Long productId) {
+        return productHashTagRepository.findByProductId(productId);
+    }
+}
\ No newline at end of file
diff --git a/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productKeyword/repository/ProductKeywordRepository.java b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productKeyword/repository/ProductKeywordRepository.java
new file mode 100644
index 0000000..faf58a0
--- /dev/null
+++ b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productKeyword/repository/ProductKeywordRepository.java
@@ -0,0 +1,10 @@
+package com.example.mutbooks.app.productKeyword.repository;
+
+import com.example.mutbooks.app.productKeyword.entity.ProductKeyword;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.Optional;
+
+public interface ProductKeywordRepository extends JpaRepository<ProductKeyword, Long> {
+    Optional<ProductKeyword> findByContent(String content);
+}
diff --git a/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productKeyword/service/ProductKeywordService.java b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productKeyword/service/ProductKeywordService.java
new file mode 100644
index 0000000..1d9b2e9
--- /dev/null
+++ b/2Week_Mission/mutbooks/src/main/java/com/example/mutbooks/app/productKeyword/service/ProductKeywordService.java
@@ -0,0 +1,36 @@
+package com.example.mutbooks.app.productKeyword.service;
+
+import com.example.mutbooks.app.productKeyword.entity.ProductKeyword;
+import com.example.mutbooks.app.productKeyword.repository.ProductKeywordRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Optional;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class ProductKeywordService {
+    private final ProductKeywordRepository productKeywordRepository;
+
+    // 도서 해시태그 키워드 저장
+    @Transactional
+    public ProductKeyword save(String content) {
+        Optional<ProductKeyword> optionalProductKeyword = productKeywordRepository.findByContent(content);
+
+        // 1. 해당 키워드가(content)가 DB에 있으면 바로 리턴
+        if (optionalProductKeyword.isPresent()) {
+            return optionalProductKeyword.get();
+        }
+
+        // 2. 해당 키워드(content)가 DB에 없으면 저장
+        ProductKeyword productKeyword = ProductKeyword.builder()
+                .content(content)
+                .build();
+
+        productKeywordRepository.save(productKeyword);
+
+        return productKeyword;
+    }
+}