Children are a high prevalence of leukemia, the reasons for which, in addition to the relatively weak immune function of children, harmful gases emitted from indoor decoration materials, improper medication, excessive preservatives in food, a large number of pesticides remaining on vegetables, and drugs in fish, poultry, meat and eggs are factors that cannot be ignored. 1.Appropriate exercise: let children do more outdoor activities when the air is fresh to enhance immunity. 2, regulate the diet: usually in the diet to achieve a reasonable diet, to prevent the emergence of acidic body endanger the health of children. 3, away from pollution: reduce children’s activities in the polluted environment time. It is best to use environmentally friendly materials that are harmless to the human body to decorate the home Children’s room as far as possible using simple decoration, good ventilation after renovation for 6 months before living. Attention should be paid to stay away from high-voltage lines, substations and microwave ovens in use, etc. 4, reasonable use of drugs: children should pay attention to the safety of medication when they are sick, should not abuse drugs without authorization. Be careful when using chloramphenicol, cytotoxic anticancer drugs, immunosuppressants and other drugs, as well as using hair dyes sparingly or not. 5, pay attention to hygiene: children eat less processed food, vegetables and fruits should be cleaned before consumption, and those that can be peeled as much as possible after peeling. 6. Be alert to diseases: If parents find that their children have anemia, weakness, white face, unexplained fever, bleeding and other symptoms, they should immediately take their children to the hospital for examination by a hematologist.