Fever after chemotherapy for leukemia, according to different reasons, its treatment is as follows: 1, after chemotherapy for leukemia, patients have bone marrow suppression, lower white blood cells, low immunity, and are prone to infections, including to bacterial and viral infections in the environment, which can cause fever, mainly give patients white-raising treatment to improve white blood cells, avoid patients going to crowded areas to avoid re-infection and cross-infection, strengthen nutrition and improve Patients’ physical fitness; 2. chemotherapy drugs such as cytarabine: the drug itself will cause fever, but the fever fever is low, usually not more than 38.5℃. According to the patient’s general condition, if the patient’s general condition is still acceptable, physical cooling and warm water baths can be considered to relieve the symptoms. If the patient does not have a long fever, consider continuing it next time. If the patient has fever for a long time and the general condition is poor, consider replacing the drug or adjusting the drug dose; 3. The patient’s disease itself is feverish: fever in leukemia is its main symptom. There may also be fever caused by tumor chemotherapy, which dissolves in the blood and releases mediators, but the fever is generally low and will not exceed 38.5℃. According to the patient’s different conditions of fever active symptomatic treatment.