diff --git a/docs/20260225_채널후원메시지_캔_천단위콤마추가.md b/docs/20260225_채널후원메시지_캔_천단위콤마추가.md
new file mode 100644
index 00000000..ab188846
--- /dev/null
+++ b/docs/20260225_채널후원메시지_캔_천단위콤마추가.md
@@ -0,0 +1,21 @@
+# 20260225_채널후원메시지_캔_천단위콤마추가
+
+## 구현 항목
+- [x] `ChannelDonationService.kt`의 `buildMessage` 함수 수정 (캔 수량 천단위 콤마 추가)
+- [x] 관련 테스트 코드를 통한 검증
+
+## 검증 기록
+### 1차 구현
+- **무엇을**: `buildMessage` 함수 내에서 `can` 변수를 `String.format("%,d", can)`으로 포맷팅하도록 수정
+- **왜**: 후원 메시지 표시 시 캔 수량에 천단위 콤마를 추가하여 가독성을 높이기 위함
+- **어떻게**:
+    - `ChannelDonationService.kt` 수정
+    - `./gradlew test` 실행 후 결과 확인
+
+### 2차 수정
+- **무엇을**: `ChannelDonationServiceTest`에 `can = 1000`일 때 메시지가 `1,000캔` 형식으로 생성되는지 검증하는 테스트(`shouldFormatCanWithCommaInDonationMessage`)를 추가하고 문서 체크박스를 완료 처리
+- **왜**: 기존 테스트는 천단위 콤마 포맷을 직접 검증하지 않아 문서의 "관련 테스트 코드를 통한 검증" 항목을 충족하기 어려웠기 때문
+- **어떻게**:
+    - `src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationServiceTest.kt`에 메시지 포맷 검증 테스트 추가
+    - `./gradlew test --tests "kr.co.vividnext.sodalive.explorer.profile.channelDonation.ChannelDonationServiceTest"` 실행: 성공
+    - `./gradlew build` 실행: 성공
diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationService.kt b/src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationService.kt
index d6cba758..d1006170 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationService.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationService.kt
@@ -117,7 +117,8 @@ class ChannelDonationService(
         } else {
             "explorer.channel_donation.message.default.public"
         }
-        val defaultMessage = getMessage(key, can)
+        val formattedCan = String.format("%,d", can)
+        val defaultMessage = getMessage(key, formattedCan)
 
         return if (additionalMessage.isNullOrBlank()) {
             defaultMessage
diff --git a/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationControllerTest.kt b/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationControllerTest.kt
index 79ecd128..3babff1a 100644
--- a/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationControllerTest.kt
+++ b/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationControllerTest.kt
@@ -59,9 +59,9 @@ class ChannelDonationControllerTest {
             memberId = member.id!!,
             nickname = member.nickname,
             profileUrl = "https://cdn.test/profile/default-profile.png",
-            can = 3,
+            can = 1000,
             isSecret = false,
-            message = "3캔을 후원하셨습니다.",
+            message = "1,000캔을 후원하셨습니다.",
             createdAt = "2026-02-23T09:30:00"
         )
         val response = GetChannelDonationListResponse(totalCount = 1, items = listOf(item))
diff --git a/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationServiceTest.kt b/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationServiceTest.kt
index e3d86771..d9705cb0 100644
--- a/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationServiceTest.kt
+++ b/src/test/kotlin/kr/co/vividnext/sodalive/explorer/profile/channelDonation/ChannelDonationServiceTest.kt
@@ -110,6 +110,46 @@ class ChannelDonationServiceTest {
         )
     }
 
+    @Test
+    fun shouldFormatCanWithCommaInDonationMessage() {
+        val creator = createMember(id = 1L, role = MemberRole.CREATOR, nickname = "creator")
+        val viewer = createMember(id = 2L, role = MemberRole.USER, nickname = "viewer")
+        val message = ChannelDonationMessage(can = 1000, isSecret = true, additionalMessage = "응원합니다")
+        message.id = 1001L
+        message.member = viewer
+        message.creator = creator
+        message.createdAt = LocalDateTime.of(2026, 2, 20, 12, 0, 0)
+
+        Mockito.`when`(memberRepository.findCreatorByIdOrNull(creator.id!!)).thenReturn(creator)
+        Mockito.`when`(
+            channelDonationMessageRepository.getChannelDonationMessageTotalCount(
+                Mockito.eq(creator.id!!),
+                Mockito.eq(viewer.id!!),
+                Mockito.eq(false),
+                anyLocalDateTime()
+            )
+        ).thenReturn(1)
+        Mockito.`when`(
+            channelDonationMessageRepository.getChannelDonationMessageList(
+                Mockito.eq(creator.id!!),
+                Mockito.eq(viewer.id!!),
+                Mockito.eq(false),
+                Mockito.eq(0L),
+                Mockito.eq(5L),
+                anyLocalDateTime()
+            )
+        ).thenReturn(listOf(message))
+
+        val result = service.getChannelDonationList(
+            creatorId = creator.id!!,
+            member = viewer,
+            offset = 0,
+            limit = 5
+        )
+
+        assertEquals("1,000캔을 비밀후원하셨습니다.\n\"응원합니다\"", result.items[0].message)
+    }
+
     @Test
     fun shouldPassCreatorVisibilityFlagToRepositoryWhenRequesterIsCreatorSelf() {
         val creator = createMember(id = 1L, role = MemberRole.CREATOR, nickname = "creator")