1, maintain a good state of mind, appropriate way to release the pressure in life and work, light fame and fortune, appropriate physical exercise, active treatment of chronic atrophic gastritis, gastric ulcer, family multiple colorectal polyps, oral white spots, long-term untreated ulcers in various parts. 2.Regular physical examination, timely treatment of detected precancerous lesions, timely adjustment of diet and control of obesity. 3.Do not smoke and do not drink alcohol in excess. 4.Do not eat moldy food, do not use peanut oil and corn oil from infected areas. Eat less barbecued food, less pickled food, less delicate vitamin-deficient food, do not drink raw water, especially water that has received contamination, as the water source in Shijiazhuang is surface water, it is recommended to use water purifiers. When eating, chew slowly, do not eat overheated food, avoid gobbling, match meat and vegetables, eat less high-fat food, eat more fresh fruits and vegetables, and drink green tea appropriately to prevent liver cancer. Develop good hygiene habits, wash hands regularly, avoid cross-infection when cutting hair, and recommend timely vaccination against hepatitis B when there are hepatitis B patients around. 5.Moderate physical exercise, avoid over-exercising and avoid obesity. When air pollution is serious, try to reduce going out, proper protection of the respiratory tract, to avoid the impact of environmental pollution on the organism. For workers who work with radioactive substances often work well in radiation protection, ensure ventilation, and workers with other occupational exposure try to do well in personal hygiene and protection to avoid absorbing and bringing home carcinogens.