diff --git a/src/main/java/com/salemale/domain/chat/controller/ChatController.java b/src/main/java/com/salemale/domain/chat/controller/ChatController.java
index 6529e7b..e77f512 100644
--- a/src/main/java/com/salemale/domain/chat/controller/ChatController.java
+++ b/src/main/java/com/salemale/domain/chat/controller/ChatController.java
@@ -11,6 +11,7 @@
 import org.springframework.web.bind.annotation.*; // REST API용 어노테이션 (@GetMapping 등)
 import java.util.List; // 리스트 응답용
 import java.net.URI; //응답 헤더 생성
+import com.salemale.domain.chat.dto.BlockStatusResponse; //차단 여부
 import com.salemale.domain.chat.dto.ChatDtos.ChatIdUnread;
 
 /**
@@ -109,7 +110,7 @@ public ResponseEntity<ApiResponse<MessageDtos.ReadAllResponse>> readAllInChat(
      -채팅방에서 대화 상대 차단
      */
     @Operation(summary = "대화 상대 차단", description = "상대방을 차단하고 상대방이 경매 등록한 물품이 보이지 않게 됨.")
-    @PostMapping("/{chatId}/block")
+    @PostMapping("/chats/{chatId}/block")
     public ResponseEntity<ApiResponse<BlockResponse>> blockPartner(
             @RequestHeader("user-id") Long me,
             @PathVariable Long chatId
@@ -123,7 +124,7 @@ public ResponseEntity<ApiResponse<BlockResponse>> blockPartner(
      -채팅방에서 대화 상대 차단 해제
      */
     @Operation(summary = "대화 상대 차단 해제", description = "상대방을 차단 해제.")
-    @PostMapping("/{chatId}/unblock")
+    @PostMapping("/chats/{chatId}/unblock")
     public ResponseEntity<ApiResponse<BlockResponse>> unblockPartner(
             @RequestHeader("user-id") Long me,
             @PathVariable Long chatId
@@ -131,4 +132,17 @@ public ResponseEntity<ApiResponse<BlockResponse>> unblockPartner(
         BlockResponse res = chatService.unblockPartner(me, chatId);
         return ResponseEntity.ok(ApiResponse.onSuccess(res));
     }
+
+    @Operation(summary = "대화 상대 차단 여부 조회", description = "상대방을 차단 여부 조회.")
+    @GetMapping("/chats/{chatId}/block")
+    public ResponseEntity<ApiResponse<BlockStatusResponse>> getBlockStatus(
+            @RequestHeader("user-id") Long me,
+            @PathVariable Long chatId
+    ) {
+        BlockStatusResponse res = chatService.getBlockStatus(me, chatId);
+        return ResponseEntity.ok(ApiResponse.onSuccess(res));
+    }
+
+
+
 }
diff --git a/src/main/java/com/salemale/domain/chat/dto/BlockStatusResponse.java b/src/main/java/com/salemale/domain/chat/dto/BlockStatusResponse.java
new file mode 100644
index 0000000..42434ad
--- /dev/null
+++ b/src/main/java/com/salemale/domain/chat/dto/BlockStatusResponse.java
@@ -0,0 +1,12 @@
+package com.salemale.domain.chat.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+
+@Data
+@AllArgsConstructor
+public class BlockStatusResponse {
+
+    private boolean iBlockedPartner;   // 내가 상대를 차단했는지
+    private boolean partnerBlockedMe;  // 상대가 나를 차단했는지
+}
diff --git a/src/main/java/com/salemale/domain/chat/dto/ChatDtos.java b/src/main/java/com/salemale/domain/chat/dto/ChatDtos.java
index 54ff60f..ec9cb3b 100644
--- a/src/main/java/com/salemale/domain/chat/dto/ChatDtos.java
+++ b/src/main/java/com/salemale/domain/chat/dto/ChatDtos.java
@@ -25,8 +25,7 @@ public static class CreateChatRequest {
         private Long sellerId; // 판매자 ID
         private Long buyerId;  // 구매자 ID
     }
-
-
+ 
     /**채팅방 목록 : chatId + unreadCount
      */
     @Getter @NoArgsConstructor @AllArgsConstructor @Builder
@@ -51,6 +50,11 @@ public static class ChatSummaryResponse {
         //아이템 정보 추가
         private ItemSummary item;
 
+        // 내가 이 대화 상대를 차단했는지 여부
+        // true  -> 이미 차단됨
+        // false -> 차단 안 됨
+        private boolean iBlockedPartner;
+
         @Getter @NoArgsConstructor @AllArgsConstructor @Builder
         public static class Partner {
             private Long id;
diff --git a/src/main/java/com/salemale/domain/chat/service/ChatService.java b/src/main/java/com/salemale/domain/chat/service/ChatService.java
index 36886dc..cb83666 100644
--- a/src/main/java/com/salemale/domain/chat/service/ChatService.java
+++ b/src/main/java/com/salemale/domain/chat/service/ChatService.java
@@ -3,6 +3,7 @@
 import com.salemale.domain.chat.dto.BlockResponse;
 import com.salemale.domain.chat.dto.ChatDtos.*; // DTO
 import com.salemale.domain.chat.dto.MessageDtos;
+import com.salemale.domain.chat.dto.BlockStatusResponse; //차단 여부
 import com.salemale.domain.chat.entity.Chat; // 채팅 엔티티
 import com.salemale.domain.chat.entity.Message; //메시지 엔티티
 import com.salemale.domain.chat.repository.ChatRepository; // 채팅 리포지토리
@@ -25,7 +26,9 @@
 import java.time.LocalDateTime;
 import java.util.List;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import org.springframework.data.domain.Pageable;
 
@@ -55,6 +58,11 @@ public List<ChatSummaryResponse> getChatSummaries(Long me, int page, int size) {
 
         List<ChatSummaryRow> rows = chatRepository.findChatSummaries(me, offset, size);
 
+        // 내가 차단한 사용자 id 목록을 한 번에 조회
+        List<Long> blockedUserIds = blockListRepository.findBlockedUserIds(me);
+        java.util.Set<Long> blockedSet = new java.util.HashSet<>(blockedUserIds);
+
+
         return rows.stream().map(r -> {
             // 대화 상대
             ChatSummaryResponse.Partner partner = ChatSummaryResponse.Partner.builder()
@@ -103,12 +111,16 @@ public List<ChatSummaryResponse> getChatSummaries(Long me, int page, int size) {
                         .build();
             }
 
+            // 내가 이 대화 상대를 차단했는지 여부
+            boolean iBlockedPartner = blockedSet.contains(r.getPartnerId());
+
             return ChatSummaryResponse.builder()
                     .chatId(r.getChatId())
                     .partner(partner)
                     .lastMessage(last)
                     .unreadCount(r.getUnreadCount() == null ? 0 : r.getUnreadCount())
                     .item(itemSummary)
+                    .iBlockedPartner(iBlockedPartner) //차단 여부 추가
                     .build();
         }).toList();
     }
@@ -294,15 +306,19 @@ public BlockResponse blockPartner(Long me, Long chatId) {
         Chat chat = chatRepository.findById(chatId)
                 .orElseThrow(() -> new EntityNotFoundException("채팅방이 존재하지 않습니다."));
 
+        if (!chat.getSeller().getId().equals(me) && !chat.getBuyer().getId().equals(me)) {
+            throw new IllegalStateException("대화 참여자가 아닙니다.");
+        }
+
         Long partnerId = chat.getSeller().getId().equals(me)
                 ? chat.getBuyer().getId()
                 : chat.getSeller().getId();
 
-        // 이미 차단된 경우 → blocked=false 로 반환 (프론트가 "이미 차단됨" UI 처리 가능)
+        // 이미 차단된 경우
         if (blockListRepository.existsByBlocker_IdAndBlocked_Id(me, partnerId)) {
             return BlockResponse.builder()
                     .blockedUserId(partnerId)
-                    .blocked(false)
+                    .blocked(true)
                     .build();
         }
 
@@ -327,6 +343,12 @@ public BlockResponse unblockPartner(Long me, Long chatId) {
         Chat chat = chatRepository.findById(chatId)
                 .orElseThrow(() -> new EntityNotFoundException("채팅방이 존재하지 않습니다."));
 
+        // 참여자 검증(코드래빗 피드백)
+        if (!chat.getSeller().getId().equals(me) && !chat.getBuyer().getId().equals(me)) {
+            throw new IllegalStateException("대화 참여자가 아닙니다.");
+        }
+
+
         Long partnerId = chat.getSeller().getId().equals(me)
                 ? chat.getBuyer().getId()
                 : chat.getSeller().getId();
@@ -347,4 +369,28 @@ public BlockResponse unblockPartner(Long me, Long chatId) {
                 .build();
     }
 
+    @Transactional(readOnly = true)
+    public BlockStatusResponse getBlockStatus(Long me, Long chatId) {
+
+        Chat chat = chatRepository.findById(chatId)
+                .orElseThrow(() -> new EntityNotFoundException("채팅방이 존재하지 않습니다."));
+
+        if (!chat.getSeller().getId().equals(me) && !chat.getBuyer().getId().equals(me)) {
+            throw new IllegalStateException("대화 참여자가 아닙니다.");
+        }
+
+        Long partnerId = chat.getSeller().getId().equals(me)
+                ? chat.getBuyer().getId()
+                : chat.getSeller().getId();
+
+        boolean iBlockedPartner =
+                blockListRepository.existsByBlocker_IdAndBlocked_Id(me, partnerId);
+
+        boolean partnerBlockedMe =
+                blockListRepository.existsByBlocker_IdAndBlocked_Id(partnerId, me);
+
+        return new BlockStatusResponse(iBlockedPartner, partnerBlockedMe);
+    }
+
+
 }