diff --git a/changelogs/unreleased/6587-Lyndon-Li b/changelogs/unreleased/6587-Lyndon-Li
new file mode 100644
index 0000000000..3783804833
--- /dev/null
+++ b/changelogs/unreleased/6587-Lyndon-Li
@@ -0,0 +1 @@
+Fix issue 6575, flush the repo after delete the snapshot, otherwise, the changes(deleting repo snapshot) cannot committed to the repo.
\ No newline at end of file
diff --git a/pkg/repository/provider/unified_repo.go b/pkg/repository/provider/unified_repo.go
index 592d271acc..0984826b95 100644
--- a/pkg/repository/provider/unified_repo.go
+++ b/pkg/repository/provider/unified_repo.go
@@ -302,6 +302,11 @@ func (urp *unifiedRepoProvider) Forget(ctx context.Context, snapshotID string, p
 		return errors.Wrap(err, "error to delete manifest")
 	}
 
+	err = bkRepo.Flush(ctx)
+	if err != nil {
+		return errors.Wrap(err, "error to flush repo")
+	}
+
 	log.Debug("Forget snapshot complete")
 
 	return nil