diff --git a/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupQueryService.java b/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupQueryService.java
index 32360ce..cd83e87 100644
--- a/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupQueryService.java
+++ b/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupQueryService.java
@@ -1,11 +1,14 @@
 package org.haedal.zzansuni.domain.challengegroup;
 
 import lombok.RequiredArgsConstructor;
+import org.haedal.zzansuni.domain.user.UserModel;
 import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.ArrayList;
 import java.util.List;
 
 @Service
@@ -34,12 +37,30 @@ public Page<ChallengeGroupModel.Info> getChallengeGroupsShortsPaging(Pageable pa
     }
 
     public Page<ChallengeGroupModel.Ranking> getChallengeGroupRankingsPaging(Long challengeGroupId, Pageable pageable) {
-        ChallengeGroup challengeGroup = challengeGroupReader.getById(challengeGroupId);
-        throw new UnsupportedOperationException("Not implemented yet");
+        Page<ChallengeGroupUserExp> challengeGroupUserExps
+                = challengeGroupReader.getByChallengeGroupId(challengeGroupId, pageable);
 
+        return getRankingPage(pageable, challengeGroupUserExps);
+    }
+
+    private static PageImpl<ChallengeGroupModel.Ranking> getRankingPage(Pageable pageable, Page<ChallengeGroupUserExp> challengeGroupUserExps) {
+        List<ChallengeGroupModel.Ranking> rankings = new ArrayList<>();
+        for(int i = 0; i < challengeGroupUserExps.getContent().size(); i++) {
+            Integer rank = challengeGroupUserExps.getNumber() * challengeGroupUserExps.getSize() + 1 + i;
+            ChallengeGroupUserExp challengeGroupUserExp = challengeGroupUserExps.getContent().get(i);
+            var rankingModel = ChallengeGroupModel.Ranking.builder()
+                    .user(UserModel.from(challengeGroupUserExp.getUser()))
+                    .accumulatedPoint(challengeGroupUserExp.getTotalExp())
+                    .rank(rank)
+                    .build();
+            rankings.add(rankingModel);
+        }
+        return new PageImpl<>(rankings, pageable, challengeGroupUserExps.getTotalElements());
     }
 
     public ChallengeGroupModel.Ranking getChallengeGroupRanking(Long challengeGroupId, Long id) {
-        throw new UnsupportedOperationException("Not implemented yet");
+        return challengeGroupReader.getRanking(challengeGroupId, id);
     }
+
+
 }
diff --git a/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupReader.java b/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupReader.java
index e80db83..4652b6d 100644
--- a/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupReader.java
+++ b/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/domain/challengegroup/ChallengeGroupReader.java
@@ -15,4 +15,8 @@ public interface ChallengeGroupReader {
     Page<ChallengeGroup> getChallengeGroupsShortsPaging(Pageable pageable, Long userId);
 
     Optional<ChallengeGroupUserExp> findByChallengeGroupIdAndUserId(Long challengeGroupId, Long userId);
+
+    Page<ChallengeGroupUserExp> getByChallengeGroupId(Long challengeGroupId, Pageable pageable);
+
+    ChallengeGroupModel.Ranking getRanking(Long challengeGroupId, Long userId);
 }
diff --git a/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/infrastructure/challengegroup/ChallengeGroupReaderImpl.java b/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/infrastructure/challengegroup/ChallengeGroupReaderImpl.java
index 616e983..93c87f6 100644
--- a/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/infrastructure/challengegroup/ChallengeGroupReaderImpl.java
+++ b/zzansuni-api-server/app/src/main/java/org/haedal/zzansuni/infrastructure/challengegroup/ChallengeGroupReaderImpl.java
@@ -7,9 +7,13 @@
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import lombok.RequiredArgsConstructor;
 import org.haedal.zzansuni.domain.challengegroup.*;
+import org.haedal.zzansuni.domain.user.QUser;
+import org.haedal.zzansuni.domain.user.User;
+import org.haedal.zzansuni.domain.user.UserModel;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageImpl;
 import org.springframework.data.domain.Pageable;
+import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Component;
 
 import java.util.List;
@@ -20,6 +24,7 @@
 @RequiredArgsConstructor
 public class ChallengeGroupReaderImpl implements ChallengeGroupReader {
     private final JPAQueryFactory queryFactory;
+    private final JdbcTemplate jdbcTemplate;
     private final ChallengeGroupRepository challengeGroupRepository;
     @Override
     public ChallengeGroup getById(Long challengeGroupId) {
@@ -85,4 +90,57 @@ public Optional<ChallengeGroupUserExp> findByChallengeGroupIdAndUserId(Long chal
         return Optional.ofNullable(result);
     }
 
+    @Override
+    public Page<ChallengeGroupUserExp> getByChallengeGroupId(Long challengeGroupId, Pageable pageable) {
+        Long count = queryFactory
+                .select(QChallengeGroupUserExp.challengeGroupUserExp.count())
+                .from(QChallengeGroupUserExp.challengeGroupUserExp)
+                .where(QChallengeGroupUserExp.challengeGroupUserExp.challengeGroup.id.eq(challengeGroupId))
+                .fetchOne();
+
+        List<ChallengeGroupUserExp> page = queryFactory
+                .selectFrom(QChallengeGroupUserExp.challengeGroupUserExp)
+                .where(QChallengeGroupUserExp.challengeGroupUserExp.challengeGroup.id.eq(challengeGroupId))
+                .orderBy(QChallengeGroupUserExp.challengeGroupUserExp.totalExp.desc())
+                .offset(pageable.getOffset())
+                .limit(pageable.getPageSize())
+                .fetch();
+
+        return new PageImpl<>(page, pageable, count == null ? 0 : count);
+    }
+
+    @Override
+    public ChallengeGroupModel.Ranking getRanking(Long challengeGroupId, Long userId) {
+        User user = queryFactory
+                .selectFrom(QUser.user)
+                .where(QUser.user.id.eq(userId))
+                .fetchOne();
+        if(user == null) {
+            throw new NoSuchElementException();
+        }
+
+        String sql = "SELECT ranked.rank1 FROM (" +
+                "  SELECT user_id, RANK() OVER (ORDER BY total_exp DESC) as rank1 " +
+                "  FROM challenge_group_user_exp " +
+                "  WHERE challenge_group_id = ?" +
+                ") as ranked " +
+                "WHERE ranked.user_id = ?";
+
+        Integer rank = jdbcTemplate.queryForObject(sql, Integer.class, challengeGroupId, userId);
+
+
+        ChallengeGroupUserExp challengeGroupUserExp = queryFactory
+                .select(QChallengeGroupUserExp.challengeGroupUserExp)
+                .from(QChallengeGroupUserExp.challengeGroupUserExp)
+                .where(QChallengeGroupUserExp.challengeGroupUserExp.challengeGroup.id.eq(challengeGroupId)
+                        .and(QChallengeGroupUserExp.challengeGroupUserExp.user.id.eq(userId)))
+                .fetchOne();
+
+        return ChallengeGroupModel.Ranking.builder()
+                .rank(rank==null ? 0 : rank)
+                .accumulatedPoint(challengeGroupUserExp != null ? challengeGroupUserExp.getTotalExp() : 0)
+                .user(UserModel.from(user))
+                .build();
+    }
+
 }