diff --git a/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingCheckServiceImpl.java b/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingCheckServiceImpl.java
index 9b06743..6010b6f 100644
--- a/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingCheckServiceImpl.java
+++ b/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingCheckServiceImpl.java
@@ -12,14 +12,12 @@
 import com.hsu.shimpyoo.domain.user.entity.User;
 import com.hsu.shimpyoo.domain.user.repository.UserRepository;
 import com.hsu.shimpyoo.global.aws.s3.service.S3Service;
-import com.hsu.shimpyoo.global.response.CustomAPIResponse;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
-import org.springframework.web.ErrorResponseException;
 import org.springframework.web.client.RestTemplate;
 import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.server.ResponseStatusException;
diff --git a/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingService.java b/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingService.java
index 7f98c1c..beb3935 100644
--- a/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingService.java
+++ b/src/main/java/com/hsu/shimpyoo/domain/breathing/service/BreathingService.java
@@ -75,14 +75,22 @@ public CustomAPIResponse<Map<String, Object>> calculateBreathingResult(Breathing
         // 현재 요일에 해당하는 WeekDay Enum을 가져옵니다.
         WeekDay currentWeekDay = WeekDay.valueOf(LocalDateTime.now().getDayOfWeek().name());
 
-        // DailyPef 데이터베이스에 상태와 최대호기량을 저장
-        DailyPef dailyPef = DailyPef.builder()
-                .userId(user)
-                .pef(maxBreathingRate)
-                .state(state) // Enum 타입으로 상태 저장
-                .weekDay(currentWeekDay) // Enum 타입으로 요일 저장
-                .build();
-        dailyPefRepository.save(dailyPef);
+        LocalDateTime startOfToday = LocalDate.now().atStartOfDay();  // 오늘의 시작 시간
+        LocalDateTime endOfToday = LocalDate.now().atTime(LocalTime.MAX);  // 오늘의 끝 시간
+
+        // 이미 오늘의 DailyPef 데이터가 저장되어 있는지 확인
+        Optional<DailyPef> existingDailyPef = dailyPefRepository.findTopByUserIdAndCreatedAtBetweenOrderByCreatedAtDesc(user, startOfToday, endOfToday);
+
+        // 오늘의 데이터가 없을 때만 저장
+        if (!existingDailyPef.isPresent()) { // DailyPef 데이터베이스에 상태와 최대호기량을 저장
+            DailyPef dailyPef = DailyPef.builder()
+                    .userId(user)
+                    .pef(maxBreathingRate)
+                    .state(state) // Enum 타입으로 상태 저장
+                    .weekDay(currentWeekDay) // Enum 타입으로 요일 저장
+                    .build();
+            dailyPefRepository.save(dailyPef);
+        }
 
         // 반환 데이터
         Map<String, Object> responseData = new LinkedHashMap<>();
diff --git a/src/main/java/com/hsu/shimpyoo/domain/breathing/web/controller/BreathingController.java b/src/main/java/com/hsu/shimpyoo/domain/breathing/web/controller/BreathingController.java
index fe91b83..6dc874a 100644
--- a/src/main/java/com/hsu/shimpyoo/domain/breathing/web/controller/BreathingController.java
+++ b/src/main/java/com/hsu/shimpyoo/domain/breathing/web/controller/BreathingController.java
@@ -29,18 +29,6 @@ public class BreathingController {
     private final UserRepository userRepository;
     private final BreathingRepository breathingRepository;
 
-//    // 오늘의 쉼 결과
-//    @PostMapping("/today/result")
-//    public CustomAPIResponse<Map<String, Object>> getTodayBreathingResult(
-//            @RequestBody BreathingPefDto dto) {
-//        // 현재 로그인된 사용자 정보 가져오기
-//        String loginId = authenticationUserUtils.getCurrentUserId();
-//        User user = userRepository.findByLoginId(loginId)
-//                .orElseThrow(() -> new UsernameNotFoundException("해당 사용자가 존재하지 않습니다."));
-//
-//        return breathingService.calculateBreathingResult(dto, user);
-//    }
-
     // 오늘 측정한 호흡 기록을 찾아서, 결과를 조회
     @GetMapping("/today/result")
     public CustomAPIResponse<Map<String, Object>> getTodayBreathingResult() {