① The knowledge content of the same module, version A and version B is different. For example, the classification of four prisms and the concepts of regular prism and regular prism in the first chapter of compulsory 2 space geometry are not only given in version B, but also used in exams. Version A is not given. This chapter also has the concepts of spherical distance and convex polyhedron given in version B. As the same knowledge point, ② has different positions in the textbook. For example, the principle of ancestral source is mainly studied and explained in the B version of the course. Version A is given in Exploration and Discovery. There is also the third chapter intercept equation, in which version A is given in the example and version B is given in the exercise. There is also the distance between two parallel lines. Version A is given in the exercise and version B appears in the example. ③ The emphasis of training in the same chapter is different. The A version of Geometry of Space pays attention to the examination of spatial imaginative thinking, and more is to combine practical problems. Version B pays attention to the extension of concepts and cultivates students' ability to analyze problems and think logically.