The causes and prevention of leukemia for the following aspects: 1, currently confirmed and leukemia occurs with evidence related to organic solvents such as benzene, production of benzene factory personnel are 5-6 times more likely to develop leukemia than the normal population. If patients are often exposed to such substances, they should take protective measures, such as wearing gloves and masks. The paints on the furniture all contain benzene, and if relocating to a new home it is recommended to buy environmentally friendly furniture for a long time to dry so that the benzene can be effectively evaporated; 2. They should stay away from ionizing radiation, such as X-ray testing during pregnancy. When patients go to the hospital for X detection, it is recommended that patients do the necessary protective equipment, follow the doctor’s instructions to wear radiation-resistant lead clothing; 3, second-hand smoke people than the normal population has a 1.5-2 times higher chance of getting leukemia, it is recommended that friends around to quit smoking or stay away from second-hand smoke.