Cancer prevention can be divided into two levels: the first level is the state and society, such as the management of environmental pollution, public health and food safety, which require the management of the state and the joint efforts of the society; the other level is the individual, which requires us to do the following: firstly, strengthen the awareness of cancer and develop good living habits. Second, avoid contact with carcinogenic substances and factors, for example, keep the kitchen well ventilated; do a good job of occupational protection, special occupations may be exposed to some carcinogenic substances, so we should do a good job of protection; third, do a good job of prevention and treatment of infectious diseases, for example, hepatitis, cervicitis and AIDS, etc. Fourthly, to do a good job in cancer screening, regular cancer screening can detect some cancers at an early stage and improve the survival rate of patients.