Bone marrow aspiration is a diagnostic and differential diagnostic method for various blood diseases. The operation is very simple, generally the whole process of bone marrow puncture is only a few minutes, some patients in the extraction of bone marrow fluid in the moment there is a sense of soreness outside the basic feel no pain, even less than the general intravenous injection of the pain brought about by a lot of, after the end of the bone marrow puncture generally press 3-5 minutes to get up and move around. “Bone marrow aspiration is not dangerous and does not leave any after-effects. After the operation, patients are required to stay in bed for one day, keep the puncture site clean and dry, wear loose and comfortable clothes, and use 0.5% iodophor to rub the eye of the needle when there is redness and swelling.