Zhejiang Normal University cooperated with two middle schools in Lishui City, Zhejiang Province to carry out a one-year school-based teaching and research training activity. In addition to expert lectures, a large number of teaching and research activities are "heterogeneous under one roof". When I participated in the "Review of Sine Theorem and Cosine Theorem" activity, I deeply felt that the new high school mathematics textbook has been implemented in many provinces for several years, and there are many research results in curriculum, teaching materials and teaching methods. What new tricks will there be? The following is our thinking and practice. 1 Pay attention to the generation and development of mathematical knowledge. Many teachers think that this is the process of knowledge generation and development, which should be paid attention to in the process of new courses. How to reflect it in the review class? The review of the generation and development of mathematical knowledge is actually more conducive to penetrating knowledge points, improving application ability, and thus deeply understanding the background of the problem. For example, in the teaching design of reviewing sine theorem and cosine theorem, the author used an open question: "Ask students to think about what conditions (edges and angles) are given in a triangle to determine the shape of the triangle? "How can we be sure?" The students were very interested and naturally explored: how to solve a triangle with three sides, how to solve a triangle with an included angle on both sides, how to solve a triangle with a diagonal on both sides, and how to solve a triangle with two angles. Students will not only consciously review the basic contents of sine and cosine theorems, but also understand from a deeper level: how to solve a triangle with given conditions ... (This article is 2 pages long) [Continue reading this article] Praise.