The life expectancy after cure of low-risk acute lymphoblastic leukemia in children is the same as that of normal people. The general life expectancy after cure in adults is related to many factors, and the overall survival rate of patients under 30 years old is 34% to 57%, and that of those over 50 years old is 15% to 17%. 1. Children with low-risk acute lymphoblastic leukemia have a chemotherapy cure rate of more than 90%, and their life expectancy is no different from that of normal people. Drugs include cyclophosphamide and vincristine. 2. The prognosis of adult acute lymphoblastic leukemia is mainly related to age, white blood cell count at initial diagnosis, disease subtype, cytogenetic features, time to complete remission with induction therapy and level of microscopic residual lesions. These clinical and experimental data can be used to guide the treatment of acute lymphoblastic leukemia. Drugs as above. Age is one of the most important indicators for prognosis, and the efficacy of hematopoietic stem cell transplantation can show a gradual decline with age, e.g., 34% to 57% overall survival below 30 years of age and 15% to 17% above 50 years of age. Specific diagnosis and treatment should be carried out under the guidance of physicians.