In recent years, the incidence of malignant tumors has increased significantly and has become a common and frequent disease. According to statistics, there are 3.12 million new malignant tumor patients and 2 million deaths in China every year. In the past 50 years, the incidence of cancer in China has been on an upward trend, only that the spectrum of cancer incidence has changed. The original high incidence of stomach cancer, cervical cancer, esophageal cancer, nasopharyngeal cancer, and penile cancer have decreased to different degrees, while the incidence of lung cancer, breast cancer, colorectal cancer, and prostate cancer have increased significantly. Especially in big cities and coastal areas, there is a significant increase. Reasons for the increase of malignant tumor patients 1. With the development of society and the acceleration of industrialization, there are more carcinogens in our environment, such as air pollution, water pollution, abuse of food additives, the accelerated pace of life, bad habits such as smoking, drinking a lot of alcohol and fatty meals, etc., which are all factors in the development of tumor, which will cause the increase of tumor patients. With the development of medical science, diseases that seriously affect human health in the past, such as acute infectious diseases, maternal death and neonatal death, have been cured due to their clear causes, while tumors with complex causes are becoming more and more important. 3.Society is progressing, the average life expectancy of people has been extended. Take Beijing Dongcheng District as an example, the average life expectancy in 1947 was only 39 years old, but now it is more than 70 years old, the age of tumor onset is generally 50-60 years old, not that modern people are easy to get tumor, but the absolute number of tumor patients will definitely increase. 4. The progress of examination means, the patients who died in the past in a rare way can be diagnosed very clearly now. Lung cancer, liver cancer, stomach cancer, intestine cancer and esophageal cancer are the top five malignant tumors in men.