Bone marrow biopsy is a common examination method in hematology, which has important clinical significance for various hematologic diseases, especially for the diagnosis and treatment of aplastic anemia, myelofibrosis and other diseases. Bone marrow biopsy is performed by first asking the patient to take a lateral position, generally taking the posterior superior iliac spine as the puncture point, routinely disinfecting the skin, wearing sterile gloves, spreading a cavity towel, 2% lidocaine anesthesia, after anesthesia, taking the bone marrow biopsy needle and stabbing vertically, after entering the bone marrow cavity, withdrawing the needle core of the bone marrow biopsy needle, then entering the needle clockwise for 1-2 centimeters, and then withdrawing the biopsy needle clockwise, at this time in the needle tube can obtain about 1-2 centimeters of bone marrow tissue, put the bone marrow tissue in formalin fixation solution for examination, then gauze cover, tape fixation, and ask the patient to rest in bed for half an hour, the bone marrow biopsy is completed.