Chemotherapy for leukemia can be divided into three main phases: induction remission phase, consolidation therapy phase, and maintenance therapy phase. Leukemia is a class of diseases caused by massive malignant clonal proliferation of uncontrolled hematopoietic stem cells. Typical symptoms of acute leukemia are recurrent fever, and in severe cases, anemia and bleeding may occur. Chronic leukemia usually progresses more slowly, and patients mainly suffer from chronic symptoms, such as pallor, enlarged lymph nodes, liver and spleen, and in women, excessive menstruation and possibly bleeding from wounds. Typical symptoms are fever, anemia, and bleeding. Chemotherapy for leukemia is generally divided into three phases. The first phase is the induction and remission phase: it is mainly a combination therapy, aiming at rapidly removing a large number of white blood cells in the patient’s body, and usually patients can only be completely relieved after 1-2 courses of induction and remission treatment. Then the second stage, the consolidation chemotherapy stage, is entered. The consolidation chemotherapy phase, also known as post-remission therapy, can further kill residual leukemia cells. The third phase is the maintenance phase, which usually lasts for about 3 years. Leukemia patients need to be treated regularly under the guidance of their doctors.