I have imported users data into new Joomla website. But the new imported users can’t login with community builder? Why?……

After all users’ data imported into jos_users, then I come to back admin to check users. But I can’t see the new imported users……

As the old website was built by ASP + MS Sql, but now it has been re-built by Joomla and MySql. So I need to transfer the registered users into new website……