The unity of Qin-Han feudal dynasties improves the development of society, flourishes the economy and creates a good environment for friendly communication and fusion of customs among all nationalities, exerting positive and active influence on medicine. Analyses are made on the relation between customs and habits, and medical culture. it is stressed that not all customs are in line with science. Some of them might even be superstitious or anti-scientific. However, in some sense, it is the soil for the advent of medical and health care issues.