Abstract: Chu Fu-tang is the founding father of modern pediatrics in China. In his early life in Peking Union Medical College Hospital, he had a close relationship with his teacher Alexander Ashley Weech. By going through the letters of those two and relative people, along with other materials, the author tried to have a better under standing of their interaction and details of Chu Fu-tang's early academic career, from which young pediatricians could acquire academic and professional wisdom and experience. Also, this essay served as a part of the author's preliminary study of the history of pediatrics in China.