Liu Mengya, a junior high school math teacher, was a senior lecturer in Gaotu class, an outstanding teacher of the year and a star teacher. She has taught nearly one million students in Haidian 10, studied the senior high school entrance examination deeply, and built a junior high school mathematics 12 grade system, which is good at guiding students to think positively and establishing mathematical thinking. Pay attention to the "heuristic" teaching method. Through accurate, clear and enlightening teaching, I like to guide students to think actively, improve their thinking ability, establish mathematical thinking and improve their summing-up ability.