Bone marrow extraction is generally harmless. Bone marrow is a hematopoietic tissue, which generally has the ability of self-renewal, and a small amount of bone marrow fluid extraction when necessary will not affect the organism too much. Moreover, the operation helps to clarify the diagnosis of certain hematologic diseases, and to a certain extent, it is beneficial to the metabolism of the body’s cells and bone marrow; moreover, the site of bone marrow extraction is close to the body surface, which is relatively easy to take, and there are no important internal organs, blood vessels and nerves near the posterior superior iliac spine, so the operation is relatively safe. However, it is necessary to strictly control the indications and contraindications when extracting bone marrow, pay attention to the principle of aseptic operation, and avoid the occurrence of infections.