The general program of bone marrow examination includes bone marrow aspiration fluid smear and bone marrow biopsy. 1. Bone marrow aspiration fluid smear is performed in bone marrow aspiration, bone marrow fluid is extracted for smear, and bone marrow cells are categorized, which can reflect the degree of bone marrow cell proliferation, the cellular composition (red blood cells, white blood cells, platelets, etc.), the proportion, and the change of morphology within the bone marrow fluid. It has reference value for the diagnosis of some diseases such as anemia, purpura and unexplained fever. 2. Bone marrow biopsy is to take bone marrow for pathological examination, which can observe the structure of bone marrow hematopoietic tissues, the degree of bone marrow proliferation, bone marrow cell composition and morphological changes, and can find out whether there are neoplastic changes in the bone marrow or not, whether there are extramedullary tumors infiltration and so on, which can be used for the diagnosis of acute leukemia, multiple myeloma, metastatic tumor, aplastic anemia and other diseases. Bone marrow examination is mainly used for checking blood system diseases, and it is recommended to seek medical treatment in time and standardize the treatment under the guidance of professional doctors.