diff --git a/chunk.go b/chunk.go
index 6bde9a7..be01765 100644
--- a/chunk.go
+++ b/chunk.go
@@ -214,13 +214,14 @@ func Chunk(ctx context.Context,
 			var seekEnd int64 = seekStart + firstCut - 1
 			log.Infof("first cut %d, seek start at %d, end at %d", firstCut, seekStart, seekEnd)
 			log.Infof("----------------")
-			graphFiles = append(graphFiles, Finfo{
+			fi := Finfo{
 				Path:      item.Path,
 				Name:      fmt.Sprintf("%s.%08d", item.Info.Name(), fileSliceCount),
 				Info:      item.Info,
 				SeekStart: seekStart,
 				SeekEnd:   seekEnd,
-			})
+			}
+			graphFiles = append(graphFiles, tryRenameFileName([]Finfo{fi})...)
 			fileSliceCount++
 			// todo build ipld from graphFiles
 			BuildIpldGraph(ctx, append(ef.getFiles(), graphFiles...), GenGraphName(graphName, graphSliceCount, sliceTotal), parentPath, carDir, parallel, cb, expectSliceSize, ef)
@@ -239,13 +240,14 @@ func Chunk(ctx context.Context,
 				log.Infof("following cut %d, seek start at %d, end at %d", seekEnd-seekStart+1, seekStart, seekEnd)
 				log.Infof("----------------")
 				cumuSize += seekEnd - seekStart + 1
-				graphFiles = append(graphFiles, Finfo{
+				fi := Finfo{
 					Path:      item.Path,
 					Name:      fmt.Sprintf("%s.%08d", item.Info.Name(), fileSliceCount),
 					Info:      item.Info,
 					SeekStart: seekStart,
 					SeekEnd:   seekEnd,
-				})
+				}
+				graphFiles = append(graphFiles, tryRenameFileName([]Finfo{fi})...)
 				fileSliceCount++
 				if seekEnd-seekStart == partSliceSize-1 {
 					// todo build ipld from graphFiles
diff --git a/utils.go b/utils.go
index 422601f..687073e 100644
--- a/utils.go
+++ b/utils.go
@@ -598,16 +598,25 @@ func tryRenameFileName(fis []Finfo) []Finfo {
 			return in
 		}
 		// 重新拼接文件名
-		return fmt.Sprintf("%s_%s.%s", parts[0], RandomLetters(), arr[1])
+		return fmt.Sprintf("%s_%s.%s", parts[0], RandomLetters(), strings.Join(arr[1:], "."))
 	}
 
 	for i, fi := range fis {
-		// log.Infof("try rename file: %s", fi.Name)
+		log.Infof("try rename file: %s", fi.Name)
 		if nameReg.MatchString(fi.Name) {
 			newName := rename(fi.Name)
 			fis[i].Name = newName
 			// log.Infof("rename file name %s to %s", fi.Name, newName)
 		}
+		// graphsplit_sss.png.00000001
+		arr := strings.Split(fi.Name, ".")
+		if len(arr) == 3 {
+			if nameReg.MatchString(arr[0] + "." + arr[1]) {
+				newName := rename(fi.Name)
+				fis[i].Name = newName
+				// log.Infof("rename file name %s to %s", fi.Name, newName)
+			}
+		}
 	}
 
 	return fis