People who live in mountainous areas with fresh air and cold climate live longer lives, while those who live in areas with dirty air and low hot climate live shorter lives. This statement in Huangdi Neijing is consistent with modern medical research. According to the investigation and study, the mountainous area with an altitude of1500 ~ 2000m is a long-lived geographical environment, and most people over 100 years old live in densely forested areas or ethnic minority areas. Geographical environment not only affects people's life span, but also has a close relationship with diseases. According to the theory of traditional Chinese medicine, it is caused by topography. For example, in cold areas, it makes people's health and appearance solid and dense; People in dry places often suffer from xerosis; Cold and humid places often make people suffer from diseases such as rheumatism and joint pain.

In China, the distribution of cancer also has a certain regularity, with obvious regional differences. For example, the high incidence of liver cancer is mainly concentrated in Guangdong and Fujian; The high incidence area of esophageal cancer is mainly concentrated in the north, and the high incidence area of esophageal cancer at the junction of Hebei, Henan and Shanxi provinces is concentrically distributed, and the incidence rate gradually decreases from the central area to the surrounding areas. Moreover, foreign studies have also found that the relationship between geographical environment and cancer is also closely related. As early as 100 years ago, British doctors found that in Britain, the cancer mortality rate of residents living in brick soil, clay and alluvial soil in river valleys is higher, while the cancer incidence rate of residents living in hard rock areas and well-drained areas is lower. American research also found that the high incidence of cancer in the United States is concentrated around the Great Lakes, northeast and western coastal areas. Different living environments and geographical areas will lead to different people's physique and health conditions. So, what is the ideal geographical environment? The ideal geographical environment should be a place with abundant sunshine, fresh air, clean water, fertile soil and beautiful scenery.