For the results of bone marrow aspiration, the main thing is to observe the bone marrow image, which is usually stained and then the patient’s blood cells are observed under an oil microscope view. It is usually necessary to count 200-500 nucleated cells and observe the ratio of their different cells and the degree of abnormal cells in the ratio, for example, abnormal cells of 20% suggest the possibility of leukemia or meet the diagnostic criteria of leukemia. The purpose of bone marrow aspiration is to obtain enough bone marrow fluid needed, and after obtaining the fluid, different tests are performed depending on the disease. The most common and basic is to do a bone marrow smear. Generally, after the bone marrow fluid is collected, 3-5 bone marrow smears are needed for morphological observation. Some patients with suspected malignant blood diseases, such as leukemia, also need to undergo immunophenotypic examinations and even chromosomal genetic and second-generation sequencing examinations.