In America, during the end of the colonial period, the massachusetts government first asked teachers to get a certificate of teaching to become legal teachers. The demand was most popular from 1933 to 1940. After that, improving teacher's gualification and profession became the important direction of the teacher's education in America when it came to 1982, the were 28 states asking the elementary and high school teachers to get the master degree of to be educated for the teacher's education for five years to get the "legal certificate". When examing the teacher's gualification, the American government took the legal certificate system. The students graduated from teacher's colleges and those who took courses in teacher's education must pass the examination of teachers gualification, they can't become legal teachers until they get the legal teacher's certificate. The certificate was given by the state education committee or some admitted colleges. Those who with the teacher's certificate can only be gualified to be teachers, but the certificate can't assure them the teaching job. Those who hoped to teach must be recommended by someone or apply to the local educational committee, and they still had to pass an examination, other wise they can't be emplayed. To know the state certificate system of the elementary school teacher in America, is try to translate some part of the paper. "Regisement for certification of certification of teacher, counselors liberarians, administrators for Elementary and secondary schools, 1989-1990".