Fever during myelosuppression after chemotherapy for leukemia is not a cause for panic, and the cause needs to be identified and targeted. It may be due to bacterial and viral infections and chemotherapeutic drugs and other causes of fever. 1. Bacterial and viral infections: after chemotherapy for leukemia, bone marrow suppression is severe, in which white blood cells and neutrophils drop significantly, and may reach the degree of granulocyte deficiency, and at this time, it is very easy to combine with all kinds of infections, causing fever. Mainly give the patient to enhance the white treatment such as granulocyte colony-stimulating factor, increase white blood cells, avoid patients to go to the crowded area, so as to avoid re-infection and cross-infection, but also to strengthen the nutrition and so on. 2. Chemotherapeutic drugs: the drugs themselves will cause fever, but mostly low fever. If the patient is still in good condition, consider giving physical cooling, warm water baths and other methods to relieve symptoms. There are many other causes of fever during myelosuppression after chemotherapy for leukemia, and the corresponding treatments are also different. If the fever persists for a period of time without relief, it is recommended that the patient go to the hospital in time to clarify the cause of the disease, and under the guidance of the doctor, give the corresponding treatment and treatment, and should avoid blindly using drugs.