A physicist. The gauge field theory put forward by him in 1954 developed into the basis of integrating and understanding the three kinds of interaction forces of elementary particles in the 1970s. 1957, because the concept of "parity non-conservation in weak interaction" put forward by Li Zhengdao was proved by experiments, * * * won the Nobel Prize in physics together; In addition, he has made many contributions in statistical physics, condensed matter physics, quantum field theory, mathematical physics and other fields.