1, the difference in knowledge. Junior high school mathematics has few and shallow contents and narrow knowledge, while senior high school mathematics is the promotion and extension of junior high school mathematics knowledge and the perfection and sublimation of junior high school mathematics knowledge system. For example, the study of inequality, trigonometric function and solid geometry has solved many problems that junior high school thought impossible. For example, there is a meaningless stipulation on the square root of negative numbers in junior high school, but the square root of-1 in senior high school is I, that is to say, the concept of number can be extended to the range of complex numbers.

2. Differences in learning methods. Junior high school mathematics knowledge capacity is small, and students are only required to understand the topics in class. In senior high school, with the increase of knowledge points, students are required not only to listen carefully in class and imitate and do problems, but also to preview carefully before class, listen carefully in class and review carefully after class, so as to increase their knowledge through continuous accumulation.

3. Differences in thinking habits. Junior high school students have a small range of learning mathematics knowledge and a low level of knowledge, which limits their thinking on practical problems. As far as geometry is concerned, we have all been exposed to the three-dimensional space in life, but junior high school students only learn plane geometry and cannot think and judge the three-dimensional space strictly. The range of numbers in algebra is limited to the thinking of real numbers, and it is impossible to deeply solve the types of equation roots. The diversification and extensiveness of senior high school mathematics knowledge will enable students to analyze and solve problems comprehensively, meticulously, profoundly and rigorously, and also cultivate students' high-quality thinking and improve their progressive thinking.