The comparison between Pavarotti and Seth illustrates the technique of passaggio,involving the bel canto methods of covering voice when connecting our vocal range.It shows how the vocal break is occurred because of pulling chest voice.the correct voice demonstration is Pavarotti. Our training system is on the basis of isolating completely the chest voice- dominated muscles ,advocate not to connect our high note register from our speaking level. Don't mix chest voice with head voice because of the tendency of vocal break, Mix voice system does not suitable for the most of chinese-speaking people.