Acute Leukemia (AL) is a clonal malignant disease derived from hematopoietic stem cells. Excessive proliferation of any type of abnormal primitive or immature cells in bone marrow and other hematopoietic tissues, and released into peripheral blood, causing inhibition of other cells in the bone marrow and infiltration of leukemia cells from various organs. Clinical manifestations of anemia, secondary infection, hemorrhage, hepatosplenomegaly and other infiltration. One or more of the original and immature cells in the bone marrow are elevated, with cytoplasmic changes (such as nuclear malformations), elevated white blood cells, red blood cells and thrombocytopenia, or reduced whole blood cells, and a large number of immature cells. The disease develops rapidly and the natural course is only a few months.