Leukemia, also known as blood cancer, is the most common malignant tumor in the blood system. Due to the massive proliferation of leukemia cells in the bone marrow, which leads to the destruction of normal hematopoietic functions, patients develop a series of symptoms such as anemia, infection, bleeding, and organ infiltration. In the later stages of leukemia, there are two main causes of patient death: one is infection. Each accounts for 50%. When a patient is infected, due to the almost loss of immune function in the late stage of leukemia, the infection is often persistent, manifested by a temperature that does not drop, and even with the application of antipyretic drugs, the temperature drops temporarily and then rises again quickly, and the patient often ends up dying because of respiratory failure. One type of death is hemorrhage, which is caused by bleeding, especially in patients with cerebral hemorrhage, where systemic bleeding occurs because the patient has a reduced platelet count or coagulation dysfunction. In case of cerebral hemorrhage, the patient will suddenly experience impaired consciousness and respiratory distress, and will often die within a short period of time.