The incidence of malignant tumors in China is increasing, and has now surpassed cardiovascular diseases and cerebrovascular diseases, ranking first among the causes of death of our citizens, with an average of 1 in 400 people having a tumor every year. The main reasons for the increase in incidence are the increase in population aging, the increase in detection rate and the changes in natural and social environment. The main causes of malignant tumors include environmental factors, genetic mutations and immune status. When the immunity of human body is strong, the genetic mutation cells will be removed and the genetic mutation caused by environmental factors will not be able to form tumor. Therefore, immunity and tumor are two ends of a see-saw, which are in opposite directions. For this reason, various immunity-boosting treatments can prevent tumor and control its development. These include body strengthening, balanced diet, medication and so on, which vary from person to person.