每节课下来 ,反思教学过程 ,总感到有一些不如意的地方 ,需要进行改进 .校园里有个警示牌 :“学然后知不足 ,教然后知困” ,它既是对学生说的 ,更是对我们教师讲的 .一般来说 ,设计一个好的教学方案并非难事 ,难的是按照数学知识的发展线索 ,遵循学生的认知规律和心理发展规律 After each lesson, we have to reflect on the teaching process. We always feel that there are some unsatisfactory areas that need to be improved. There is a warning sign on the campus: “Learning then knowing enough, teaching then knowing difficulties”, it is not only for students, but also for the students. What our teachers talk about. Generally speaking, designing a good teaching program is not difficult. It is difficult to follow the development clues of mathematics knowledge and follow the students’ cognitive laws and psychological development rules.