Leukemia is the most common malignant tumor of the blood system. Due to the massive proliferation of leukemia cells in the bone marrow, normal hematopoietic function is destroyed. Patients develop a series of symptoms such as anemia, infection, bleeding, and organ infiltration. The routine blood indicators of leukemia patients are: a. The number of white blood cells is usually increased, often the higher the number of white blood cells, representing the more serious the disease, there are a small number of patients with a normal or reduced number of white blood cells, but it is relatively rare. Most patients are anemic, the hemoglobin concentration decreases, the number of red blood cells decreases, almost few patients have normal hemoglobin, often the more serious the disease, the more serious the degree of anemia. Third, the number of platelets is generally reduced, either mildly or moderately or severely, and the more severe the reduction in platelet count, the more serious the bleeding symptoms are, manifesting as bleeding spots and petechiae on the skin mucosa, and in severe cases, even internal bleeding from the nose and gums.