1, avoid infection: should go to public places as little as possible, less contact with infected patients; when there is an infection should be timely consultation and treatment, the changes in condition and damage caused by infection is often more serious than the impact of drugs. 2, once the condition changes, such as a large number of new purpura, abdominal pain is obvious, protein or red blood cells in the urine significantly increased, etc., should promptly consult a doctor, if necessary, hospitalization. 3.No vaccination should be given for at least 1 year after the condition is stabilized.