本文从学案为载体,教师当导演的设悬、激疑、小组讨论、实验验证和学生展示的小组合作化的教学片断出发,点赞了新课程背景下教师的角色转换。呼唤高三物理教师在复习中激活课堂,给学生更多的合作学习的时间和空间,展开想象的翅膀.真正成为课堂的主角,把学生能力培养的目标落实到课堂教学的行动中。 This article starts with the case study as a carrier, the teacher as the director of the suspension, suspense, group discussion, experimental verification and student co-operation of the group to start the film, praised the role of teachers in the context of the new curriculum conversion. Calling the third year physics teacher to activate the classroom during the review, to the students more time and space for cooperative learning, to start the imagination of the wings .Because of the real classroom become the protagonist, the objectives of the cultivation of students’ ability to implement classroom teaching.