diff --git a/VamPa/src/main/java/com/vam/mapper/ReplyMapper.java b/VamPa/src/main/java/com/vam/mapper/ReplyMapper.java
index 4c5401f..84d8509 100644
--- a/VamPa/src/main/java/com/vam/mapper/ReplyMapper.java
+++ b/VamPa/src/main/java/com/vam/mapper/ReplyMapper.java
@@ -4,6 +4,7 @@ import java.util.List;
 
 import com.vam.model.Criteria;
 import com.vam.model.ReplyDTO;
+import com.vam.model.UpdateReplyDTO;
 
 public interface ReplyMapper {
 
@@ -28,4 +29,10 @@ public interface ReplyMapper {
 	/* 댓글 삭제 */
 	public int deleteReply(int replyId);	
 	
+	/* 평점 평균 구하기 */
+	public Double getRatingAverage(int bookId);
+	
+	/* 평점 평균 반영하기 */
+	public int updateRating(UpdateReplyDTO dto);	
+	
 }
diff --git a/VamPa/src/main/java/com/vam/model/UpdateReplyDTO.java b/VamPa/src/main/java/com/vam/model/UpdateReplyDTO.java
new file mode 100644
index 0000000..1587fc6
--- /dev/null
+++ b/VamPa/src/main/java/com/vam/model/UpdateReplyDTO.java
@@ -0,0 +1,32 @@
+package com.vam.model;
+
+public class UpdateReplyDTO {
+
+	private int bookId;
+	
+	private double ratingAvg;
+
+	public int getBookId() {
+		return bookId;
+	}
+
+	public void setBookId(int bookId) {
+		this.bookId = bookId;
+	}
+
+	public double getRatingAvg() {
+		return ratingAvg;
+	}
+
+	public void setRatingAvg(double ratingAvg) {
+		this.ratingAvg = ratingAvg;
+	}
+
+	@Override
+	public String toString() {
+		return "UpdateReplyDTO [bookId=" + bookId + ", ratingAvg=" + ratingAvg + "]";
+	}
+	
+	
+	
+}
diff --git a/VamPa/src/main/java/com/vam/service/ReplyServiceImpl.java b/VamPa/src/main/java/com/vam/service/ReplyServiceImpl.java
index d71895c..3f4a01d 100644
--- a/VamPa/src/main/java/com/vam/service/ReplyServiceImpl.java
+++ b/VamPa/src/main/java/com/vam/service/ReplyServiceImpl.java
@@ -8,6 +8,7 @@ import com.vam.model.Criteria;
 import com.vam.model.PageDTO;
 import com.vam.model.ReplyDTO;
 import com.vam.model.ReplyPageDTO;
+import com.vam.model.UpdateReplyDTO;
 
 @Service
 public class ReplyServiceImpl implements ReplyService{
@@ -21,6 +22,8 @@ public class ReplyServiceImpl implements ReplyService{
 		
 		int result = replyMapper.enrollReply(dto);
 		
+		setRating(dto.getBookId());		
+		
 		return result;
 	}
 	
@@ -54,6 +57,8 @@ public class ReplyServiceImpl implements ReplyService{
 		
 		int result = replyMapper.updateReply(dto); 
 		
+		setRating(dto.getBookId());		
+		
 		return result;
 	}	
 	
@@ -68,8 +73,28 @@ public class ReplyServiceImpl implements ReplyService{
 		
 		int result = replyMapper.deleteReply(dto.getReplyId()); 
 		
+		setRating(dto.getBookId());		
+		
 		return result;
 	}		
 	
+	public void setRating(int bookId) {
+		
+		Double ratingAvg = replyMapper.getRatingAverage(bookId);	
+		
+		if(ratingAvg == null) {
+			ratingAvg = 0.0;
+		}	
+		
+		ratingAvg = (double) (Math.round(ratingAvg*10));
+		ratingAvg = ratingAvg / 10;
+		
+		UpdateReplyDTO urd = new UpdateReplyDTO();
+		urd.setBookId(bookId);
+		urd.setRatingAvg(ratingAvg);	
+		
+		replyMapper.updateRating(urd);		
+		
+	}
 	
 }
diff --git a/VamPa/src/main/resources/com/vam/mapper/ReplyMapper.xml b/VamPa/src/main/resources/com/vam/mapper/ReplyMapper.xml
index 80b497e..27b2f7b 100644
--- a/VamPa/src/main/resources/com/vam/mapper/ReplyMapper.xml
+++ b/VamPa/src/main/resources/com/vam/mapper/ReplyMapper.xml
@@ -63,7 +63,25 @@
   		DELETE FROM vam_reply
   		WHERE replyId = #{replyId}
   		
-  	</delete>		
+  	</delete>	
+  	
+   	<select id="getRatingAverage" resultType="double">
+  	
+  		select avg(rating)
+  		from vam_reply
+  		where bookId = #{bookId}
+  	
+  	</select>
+
+	<update id="updateRating">
+	
+		update vam_book
+		set ratingAvg = #{ratingAvg}
+		where bookId = #{bookId}
+	
+	</update> 		
+	
+	
 	
  
   </mapper>
\ No newline at end of file
diff --git a/VamPa/target/classes/com/vam/mapper/ReplyMapper.xml b/VamPa/target/classes/com/vam/mapper/ReplyMapper.xml
index 80b497e..27b2f7b 100644
--- a/VamPa/target/classes/com/vam/mapper/ReplyMapper.xml
+++ b/VamPa/target/classes/com/vam/mapper/ReplyMapper.xml
@@ -63,7 +63,25 @@
   		DELETE FROM vam_reply
   		WHERE replyId = #{replyId}
   		
-  	</delete>		
+  	</delete>	
+  	
+   	<select id="getRatingAverage" resultType="double">
+  	
+  		select avg(rating)
+  		from vam_reply
+  		where bookId = #{bookId}
+  	
+  	</select>
+
+	<update id="updateRating">
+	
+		update vam_book
+		set ratingAvg = #{ratingAvg}
+		where bookId = #{bookId}
+	
+	</update> 		
+	
+	
 	
  
   </mapper>
\ No newline at end of file
diff --git a/VamPa/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties b/VamPa/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties
index ffd551e..48c9b67 100644
--- a/VamPa/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties
+++ b/VamPa/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties
@@ -1,5 +1,5 @@
 #Generated by Maven Integration for Eclipse
-#Sun Jan 09 17:57:01 KST 2022
+#Thu Feb 03 02:45:21 KST 2022
 m2e.projectLocation=C\:\\Users\\sjinj\\git\\Blog_Project2\\VamPa
 m2e.projectName=VamPa
 groupId=com.vam
diff --git a/VamPa_MySQL/src/main/java/com/vam/mapper/ReplyMapper.java b/VamPa_MySQL/src/main/java/com/vam/mapper/ReplyMapper.java
index 0c0c8b9..09d1300 100644
--- a/VamPa_MySQL/src/main/java/com/vam/mapper/ReplyMapper.java
+++ b/VamPa_MySQL/src/main/java/com/vam/mapper/ReplyMapper.java
@@ -4,6 +4,7 @@ import java.util.List;
 
 import com.vam.model.Criteria;
 import com.vam.model.ReplyDTO;
+import com.vam.model.UpdateReplyDTO;
 
 public interface ReplyMapper {
 	
@@ -28,4 +29,10 @@ public interface ReplyMapper {
 	/* 댓글 삭제 */
 	public int deleteReply(int replyId);	
 	
+	/* 평점 평균 구하기 */
+	public Double getRatingAverage(int bookId);
+	
+	/* 평점 평균 반영하기 */
+	public int updateRating(UpdateReplyDTO dto);	
+	
 }
diff --git a/VamPa_MySQL/src/main/java/com/vam/model/UpdateReplyDTO.java b/VamPa_MySQL/src/main/java/com/vam/model/UpdateReplyDTO.java
new file mode 100644
index 0000000..3c80454
--- /dev/null
+++ b/VamPa_MySQL/src/main/java/com/vam/model/UpdateReplyDTO.java
@@ -0,0 +1,30 @@
+package com.vam.model;
+
+public class UpdateReplyDTO {
+	
+	private int bookId;
+	
+	private double ratingAvg;
+
+	public int getBookId() {
+		return bookId;
+	}
+
+	public void setBookId(int bookId) {
+		this.bookId = bookId;
+	}
+
+	public double getRatingAvg() {
+		return ratingAvg;
+	}
+
+	public void setRatingAvg(double ratingAvg) {
+		this.ratingAvg = ratingAvg;
+	}
+
+	@Override
+	public String toString() {
+		return "UpdateReplyDTO [bookId=" + bookId + ", ratingAvg=" + ratingAvg + "]";
+	}
+	
+}
diff --git a/VamPa_MySQL/src/main/java/com/vam/service/ReplyServiceImpl.java b/VamPa_MySQL/src/main/java/com/vam/service/ReplyServiceImpl.java
index 968d7c5..9695adc 100644
--- a/VamPa_MySQL/src/main/java/com/vam/service/ReplyServiceImpl.java
+++ b/VamPa_MySQL/src/main/java/com/vam/service/ReplyServiceImpl.java
@@ -8,6 +8,7 @@ import com.vam.model.Criteria;
 import com.vam.model.PageDTO;
 import com.vam.model.ReplyDTO;
 import com.vam.model.ReplyPageDTO;
+import com.vam.model.UpdateReplyDTO;
 
 @Service
 public class ReplyServiceImpl implements ReplyService{
@@ -21,6 +22,8 @@ public class ReplyServiceImpl implements ReplyService{
 		
 		int result = replyMapper.enrollReply(dto);
 		
+		setRating(dto.getBookId());		
+		
 		return result;
 	}	
 	
@@ -53,6 +56,8 @@ public class ReplyServiceImpl implements ReplyService{
 		
 		int result = replyMapper.updateReply(dto); 
 		
+		setRating(dto.getBookId());		
+		
 		return result;
 	}	
 	
@@ -67,7 +72,28 @@ public class ReplyServiceImpl implements ReplyService{
 		
 		int result = replyMapper.deleteReply(dto.getReplyId()); 
 		
+		setRating(dto.getBookId());		
+		
 		return result;
+	}
+	
+	public void setRating(int bookId) {
+		
+		Double ratingAvg = replyMapper.getRatingAverage(bookId);	
+		
+		if(ratingAvg == null) {
+			ratingAvg = 0.0;
+		}	
+		
+		ratingAvg = (double) (Math.round(ratingAvg*10));
+		ratingAvg = ratingAvg / 10;
+		
+		UpdateReplyDTO urd = new UpdateReplyDTO();
+		urd.setBookId(bookId);
+		urd.setRatingAvg(ratingAvg);	
+		
+		replyMapper.updateRating(urd);		
+		
 	}	
 	
 }
diff --git a/VamPa_MySQL/src/main/resources/com/vam/mapper/ReplyMapper.xml b/VamPa_MySQL/src/main/resources/com/vam/mapper/ReplyMapper.xml
index 6f7a9d9..fb70129 100644
--- a/VamPa_MySQL/src/main/resources/com/vam/mapper/ReplyMapper.xml
+++ b/VamPa_MySQL/src/main/resources/com/vam/mapper/ReplyMapper.xml
@@ -60,5 +60,21 @@
   		WHERE replyId = #{replyId}
   		
   	</delete>	
+  	
+  	   	<select id="getRatingAverage" resultType="double">
+  	
+  		select avg(rating)
+  		from vam_reply
+  		where bookId = #{bookId}
+  	
+  	</select>
+
+	<update id="updateRating">
+	
+		update vam_book
+		set ratingAvg = #{ratingAvg}
+		where bookId = #{bookId}
+	
+	</update>
  
   </mapper>
\ No newline at end of file
diff --git a/VamPa_MySQL/target/classes/com/vam/mapper/ReplyMapper.xml b/VamPa_MySQL/target/classes/com/vam/mapper/ReplyMapper.xml
index 6f7a9d9..fb70129 100644
--- a/VamPa_MySQL/target/classes/com/vam/mapper/ReplyMapper.xml
+++ b/VamPa_MySQL/target/classes/com/vam/mapper/ReplyMapper.xml
@@ -60,5 +60,21 @@
   		WHERE replyId = #{replyId}
   		
   	</delete>	
+  	
+  	   	<select id="getRatingAverage" resultType="double">
+  	
+  		select avg(rating)
+  		from vam_reply
+  		where bookId = #{bookId}
+  	
+  	</select>
+
+	<update id="updateRating">
+	
+		update vam_book
+		set ratingAvg = #{ratingAvg}
+		where bookId = #{bookId}
+	
+	</update>
  
   </mapper>
\ No newline at end of file
diff --git a/VamPa_MySQL/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties b/VamPa_MySQL/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties
index 2eeb6f2..fd515d6 100644
--- a/VamPa_MySQL/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties
+++ b/VamPa_MySQL/target/m2e-wtp/web-resources/META-INF/maven/com.vam/controller/pom.properties
@@ -1,5 +1,5 @@
 #Generated by Maven Integration for Eclipse
-#Sun Jan 09 17:57:01 KST 2022
+#Thu Feb 03 02:45:21 KST 2022
 m2e.projectLocation=C\:\\Users\\sjinj\\git\\Blog_Project2\\VamPa_MySQL
 m2e.projectName=VamPa_MySQL
 groupId=com.vam