Abstract: YANG Li-ming was the third Chinese doctor supervised by Max Born,and also the last Chinese pupil of Born. From 1950 to 1951,Born wrote many letters to very known physicists,such as Bohr,Heisenberg,Fermi,Wigner,Jordan,and some important periodicals,promoted and gave high evaluation on the research results which were made by YANG Li-ming. One could feel the intense sense of responsibility of Born to his pupil,and his appreciation to the Chinese pupil when one reading these letters carefully. These letters which were not known,are the valuable and moving archives,and they formed a clue which connected Chinese physics to the world. The letters need to be farther researched by our researchers who working on the history of physics,they also need to know and pay more concerns by the society of Chinese physics.

Key words: Max Born, YANG Li-ming, Thomas-Fermi method