It is not possible to donate bone marrow just two months after blood donation. After blood donation, white blood cells can return to the level before blood donation in about 2 days, platelets can return to the level before blood donation in about a week, and red blood cells need about 3~4 months to return to the level before blood donation. Therefore, the national compulsory blood donation law stipulates that you can only donate blood twice a year. Bone marrow donation is mainly to donate hematopoietic stem cells, how long can you donate hematopoietic stem cells after donating blood, there is no clear regulation, generally refer to the time interval of gratuitous blood donation, that is, 6 months, therefore, it is not recommended to donate blood for two months to donate bone marrow. Donate bone marrow after successful matching, but also need to carry out the corresponding matching qualified check and physical examination and other circumstances for donation, in addition to the rhythm of chemotherapy with the patient, the period is also a long process, usually also need a month or two. In addition, to donate bone marrow, it is also necessary to consider the physical condition of the donor, if the donor has a condition that is not suitable for donation, then it can not be carried out to donate bone marrow. When donating bone marrow, it must be done under the guidance of a doctor. Throughout the process of bone marrow donation, it is important to pay attention to the changes in the body and cooperate with the doctor to carry out the appropriate examination work.