The preventive measures of cancer are as follows: 1. cultivate good living habits, such as quit smoking, quit drinking, live a regular life and avoid staying up late; 2. maintain good eating habits, three regular meals and avoid intake of too spicy, too salty and too fishy diet; 3. proper physical exercise, obesity is related to the occurrence and development of many kinds of tumors, proper weight control can prevent the occurrence of tumors and is beneficial to the recovery of chronic diseases and cardiovascular system diseases; 4. regular physical examination, the symptoms of some early tumors are more insidious, through regular physical examination, the detection rate of tumors can be improved.