Tumor is an abnormal lesion formed by the loss of the normal regulation of the growth of a cell at the genetic level of a local tissue under the action of various carcinogenic factors, resulting in its clonal abnormal proliferation. Malignant tumors seriously affect people’s life and survival. Surgery, radiotherapy, chemotherapy and biologically targeted therapy are the main treatment options for tumors. However, the treatment of malignant tumors is ineffective, painful and costly. Nowadays, people are talking about cancer. So how to prevent tumor is a very critical issue for us. Primary prevention of tumor (etiological prevention) refers to the preventive measures to eliminate or reduce cancer-causing factors for the general population, to promote health and to prevent cancer before it happens. The effective preventive measures include: smoking cessation, reasonable diet, alcoholic beverages, immunization, occupational tumor prevention, and health education. Secondary prevention of tumors (pathogenetic prevention) Screening for precancerous lesions or early tumor cases in specific high-risk groups for early detection, prevention and treatment, including screening and intervention tests, including: cervical cancer screening, breast cancer screening, colorectal cancer screening, gastric cancer screening, early diagnosis and treatment of esophageal cancer, etc. Tertiary prevention of tumors Measures to prevent recurrence, reduce complications, prevent disability, improve survival and recovery rates, and reduce pain caused by tumors, such as three-step pain relief, hospice care, etc., to help patients treat.