Lecturer of Beijing No.4 Middle School, senior math teacher of Beijing No.4 Middle School, senior coach of Olympic math competition, member of Chinese Mathematical Society. New teaching concept and strong foundation. In teaching, he actively carried out teaching research, and his works include "Guidance for Middle School Mathematics Learning" and participated in the compilation of the textbook "Mathematics". He won the first prize in the national classroom teaching competition for young teachers. Re-elected as the math teacher and head teacher of the experimental class (Class A) in Senior Three, and sent away the 14 graduating class. Many Olympic competition coaches won national gold medals.