H. T. Chang (ZHANG Hongzhao) and J. S. Lee (LI Siguang) are both key people in the field of mordern geosciences in China. In order to boost economic and social development, the first generation of mordern geologists represented by J. S. Lee promoted the geosciences growth in new China（People’s Republic of China) from a difficult start. This article collects the 6 letters written by J. S. Lee to H. T. Chang during this period, with some textual research and brief explanations. A few letters are attached with H. T. Chang’s reply, and one of them is a draft which is even rarer. The contents are mainly related to the establishment of geological institutions at the beginning of new China, which can provide valuable historical information for the study of this period.