diff --git a/qingstor/qingstor.go b/qingstor/qingstor.go
index 96f0b4178..908937755 100644
--- a/qingstor/qingstor.go
+++ b/qingstor/qingstor.go
@@ -854,7 +854,7 @@ func (o *Object) Update(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOptio
 			fs.Errorf(o, "Create Object Faild, API ERROR: %v", err)
 			// Abort Upload when init success and upload failed
 			if uploadID != nil {
-				fs.Debugf(o, "Abort Upload Multipart, upload_id: %s, objectParts: %s", *uploadID, objectParts)
+				fs.Debugf(o, "Abort Upload Multipart, upload_id: %s, objectParts: %+v", *uploadID, objectParts)
 				abortReq := qs.AbortMultipartUploadInput{
 					UploadID: uploadID,
 				}
@@ -908,7 +908,7 @@ func (o *Object) Update(in io.Reader, src fs.ObjectInfo, options ...fs.OpenOptio
 	}
 
 	// Complete Multipart Upload
-	fs.Debugf(o, "Complete Upload Multipart, upload_id: %s, objectParts: %d", *uploadID, objectParts)
+	fs.Debugf(o, "Complete Upload Multipart, upload_id: %s, objectParts: %d", *uploadID, len(objectParts))
 	completeReq := qs.CompleteMultipartUploadInput{
 		UploadID:    uploadID,
 		ObjectParts: objectParts,