Leukemia is a clonal malignancy of the hematopoietic system, with a high incidence and a wide range of people. The leukemia of children may be related to environmental pollution, nutritional deficiencies and other factors; 2, people with a history of exposure to harmful substances: this group mainly contains people who work in oil fields, chemical plants or long-term contact with harmful gases drivers, renovation workers, etc. This group has a greater chance of developing blood diseases such as leukemia; 3, people who have been exposed to radiation for a long time: people who have been exposed to long-term radiation damage or ionizing radiation have a The chances of leukemia are greater, such as those engaged in radiation workers may be more likely to get leukemia than others when they are not well protected; 4, people with a family history of leukemia: leukemia has a certain heredity, if there is a family history of leukemia, then the offspring will have a higher incidence than those without a history of leukemia; 5, viral infections: the virus that predisposes to leukemia is human T-cell leukemia virus-I. The production and spread of this type of virus has a greater relationship with population movement, and abnormalities in the body’s lymphatic immune cells can occur after viral infection, increasing the risk of leukemia. In addition to the above-mentioned groups, people with certain blood diseases such as bone marrow cancer, lymphoma, congenital Down’s syndrome and Bloom’s syndrome, as well as those who are depressed and long-term smokers are at risk of developing leukemia.