Mr. He Tanglin, a senior high school math teacher in Pudong New Area, Shanghai, is an experienced and excellent teacher. He Laoshi has six years' experience in mathematics tutoring in Shanghai College Entrance Examination, and he is very talented in mathematics teaching. I have my own unique understanding of Shanghai senior high school mathematics, in-depth study of Shanghai college entrance examination mathematics, and unique teaching methods and skills. He is a rare and excellent young teacher. The biggest feature of He Laoshi's lectures is humor and easy to understand. Just like the "chemical reaction" between textbook knowledge and your brain, rather than mechanical rote learning, many students who are "insulated" from mathematics, in He Laoshi's place, have made rapid progress after class. He Laoshi often said that many students did a lot of questions, listened a lot, read a lot, and even recited a lot. When they get new questions, they still can't start, and their grades don't improve, sometimes even decline. The reason is that the basic concept is unclear and there is no correct way to solve the problem. What He Laoshi brings to students is a brand-new analysis of problem-solving ideas: what is the solution, why should it be discussed in categories, and how did it come about? He Laoshi analyzes all kinds of questions for students. The topics are ever-changing, and the only constant is thinking. He Laoshi can easily create an equal and harmonious teaching atmosphere in classroom teaching, and ask challenging new questions in time, thus stimulating students to actively participate in classroom teaching activities, leaving room for students to think, encouraging students to put forward different ideas and questions, and correcting thinking strategies and summarizing mathematical thinking methods through teacher-student communication, student-student communication, constant feedback and reflection.