Teacher of Teacher:Studies into Teacher Educators in the West

Teacher educators have the important impact on the quality of teacher education and school teachers. Therefore,in recent years,the researchers have probed into the teacher educator deeply. The studies focus on the role teacher educators play,the pressure and challenges teacher educators face,the professional expertise teacher educators need,the professional standards teacher educators should reach,and the assessment system for teacher educators. The study can provide important reference and inspiration for the research and training of supervisors for student teacher internship in China.