When patients receive radiotherapy, especially irradiating larger areas of flat bone, bone marrow, spleen and large areas of radiotherapy, such as whole lung radiotherapy, whole pelvis radiotherapy and whole abdomen radiotherapy, the hematopoietic system will be affected, leading to a decline in whole blood cells, such as a decline in white blood cells and platelets. The decline of white blood cells and platelets to a certain degree will have an impact on the human body and have certain hazards, such as patients feel general weakness, easily lead to serious infections or even sepsis, and have a tendency to bleed, leading to internal organs and intracranial bleeding leading to death. Therefore, when the white blood cells are less than 3×109/liter and platelets are less than 70×109/liter, radiotherapy should be suspended, and symptomatic treatment of blood elevation should be carried out, and treatment should be started after the blood picture recovers. However, when the radiation field is small, such as radiotherapy for pituitary tumors, or when the radiation field does not include the hematopoietic system, such as radiotherapy for the neck and soft tissues of the extremities, if the white blood cells are less than 3×109/liter but greater than 2×109/liter and platelets are less than 70×109/liter but greater than 50×109/liter, radiotherapy can still be continued, but the changes of blood cells should be closely monitored, and if there is a tendency of gradual decline, the treatment should be immediately stop the radiotherapy and strengthen the blood raising treatment.