In the view point of singing voice, the determining of the proper voice position is very important. It is also very important to establish the correct method of voice use with proper voice position. The purpose of this study is, by understanding of voice essence, to provide the guidance of correct use and the prevention of voice disorders of professional voice users. Following result were obtained. It were classified in 4 group as follows. 1) Group 1 ; The opinions of the student and teacher correspond with the laryngoscopic pictures. There were 11 males(15.7%) and 27 females(38.6%) in the group 1. 2) Group 2 ; The opinions of the student correspond with the teacher's opinion but not correspond with laryngoscopic pictures. There were 6 males(8.6%) and 7 females(10.0%) in the group 2. 3) Group 3 ; The opinions of the student not correspond with the teacher's opinion and laryngoscopic pictures. There were 5 males(7.1%) and 6 females(8.6%) in the group 3. 4) Group 4 ; The opinions of student correspond with laryngoscopic pictures but not correspond with the teacher's opinion. There were 3 males(4.3%) and 5 females(7.1%) in the group 4.