There are two forms of stem cell transplantation: First, autologous hematopoietic stem cell transplantation: the survival of patients after stem cell transplantation is closely related to the patient’s primary disease and the transplantation method taken, for example, patients with multiple myeloma or lymphoma, after autologous hematopoietic stem cell transplantation, the patient’s survival will be significantly longer, but for patients with multiple myeloma, even after hematopoietic stem cell transplantation, the patient’s However, for patients with multiple myeloma, even after HSCT, the survival period is hardly more than 20 years. Some patients with lymphoma can be cured with autologous HSCT, and their survival period is the same as normal people. Some patients with acute leukemia are completely cured after allogeneic hematopoietic stem cell transplantation, and they are a healthy person with the same life expectancy as normal people. However, some patients have relapsed after allogeneic HSCT in about three years, and the survival period of patients after relapse rarely exceeds six months.