Prostate cancer was originally one of the most common malignancies in older men in the United States and developed European countries. In the past, it was a minor disease in the spectrum of tumors in China and was not given enough attention. With the progress of social development in China, the aging of society, urbanization of population, westernization of dietary structure and advancement of detection technology, the incidence of prostate cancer in China is now significantly increasing, and it has become one of the important diseases that seriously threaten the health of elderly men in China. Age: Prostate cancer is a typical disease of old age, and age is one of the risk factors for sure. According to the American Cancer Society, more than 70% of prostate cancer patients are older than 65 years old, and the incidence rate of 60-79 years old is 1/7. The same is true in China, where 51.2% of the total number of prostate cancer patients were over 75 years old in Shanghai from 1997 to 1999. In Tianjin, the proportion of patients aged 75 years and above was also as high as 53.79% from 2000 to 2004, and the incidence rate of 85 years and above reached 84.11%. Therefore, prostate cancer, 50 to 59 years old is low risk, 60 to 69 years old is medium risk, 70 to 79 years old is high risk, and 80 to 89 years old is very high risk. As of October 2009, China has reached 160 million people over the age of 65, and it is expected to increase by 10 million every year, accounting for 11.3% of the total population, which is a sign of entering an aging society. Based on the characteristics of an increasingly aging population base and age structure, the incidence of prostate cancer is bound to increase. The incidence of prostate cancer in China is expected to rise in the next decade. The incidence of prostate cancer is now recognized to be related to a high-fat diet, for example, the incidence of prostate cancer among Chinese in Hawaii is 5.5 times higher than that of Chinese in Singapore and 9 times higher than that of Hong Kong, China. Japan is a country with a low incidence of prostate cancer in the world, but a survey of Japanese expatriates who migrated to the United States showed that the incidence was lower than in the United States but significantly higher than in Japan. China is in a stage of transition to urbanization, industrialization, and global economic integration, with rapid economic development and significant changes in dietary patterns. According to the Tianjin Bureau of Statistics, in 2000, compared with 1985, annual per capita cereal intake decreased by 53.8 kg, annual vegetable intake decreased by 45.8 kg; annual animal food increased by 3.7 kg and annual vegetable oil increased by 1.7 kg. energy from carbohydrate sources decreased from 69% to 53%; energy from fat sources increased from 19% to 33% . Thus, lifestyle changes, especially high fat intake, have led to an imbalance between risk and protective factors for prostate cancer, and a trend toward a significantly higher incidence in low-risk populations. Moreover, because prostate cancer progresses slowly, the stimulation of causative factors often takes decades to manifest as an increase in incidence, especially because of the obvious changes in the urbanization of our population, according to which not only should the incidence trend be given high priority, but also the prevention and treatment issues should be proactive. Ethnicity, family genetics and other influencing factors are omitted.