To clarify the change of teachers'role in the process of cooperative learning, we talked about the opportunity that teachers should consider to give students advice, that is to say, teachers'role in cooperative learning is that of a participant and a collaborator, to assess the situation, discuss with the students, design dialogue with the students, together with the performance... in this process can fully understand the situation of students'cooperative learning, and to a certain extent, restrain the students'habit of communicating in their mother tongue, in the process of creating a foreign language communication atmosphere to play the role of demonstration and guidance, more to promote the exchange of ideas and feelings between teachers and students.