Now in school, students to rate the teacher has become increasingly common. School authorities said the move was intended to improve the quality of teaching. So what is this "democratic fairy tale" or "innovation"? Most of the teachers think that they can implement this system, first, by student evaluation of teaching activities and promoting teachers ' awareness of services and ideas, great role to development of teachers ' morality; promoting the teaching and learning communication will help teachers improve teaching; second promoting the construction of teaching and learning style. Third student involved in the evaluation of teaching, self-consciousness of learning can be improved. Some people do not agree with these views, they first think of student teacher evaluation system limited the scope, some evaluation methods are complex, difficult to install, and often comments on subjective impressions during the operation. Finally, they believe that students biased, subjective, their evaluation of the teaching does not reflect the levels of teachers. I think we can implement the assessment system because activity helps improve students ' evaluation of teaching quality in teachers, let students prefer to listen to.