As we know that human Body suffers from various diseases, these diseases also included the disease of bone marrow. To cure this disease of bone marrow a technique name Bone Marrow Transplantation is used. In this process the bone marrow cells are transplanted. Bone Marrow is damaged by the diseases like anaemia, tb etc. This will decrease or we can say that this will lower the growth of blood cells. In the transplantation of bone marrow the cells are transfer and this process only occur if the recipient and donor are compatible for this. Neurological illness is cured by this. Donation and Transplantation is the only process that can make the bone marrow again function properly.