1.Etiological treatment Actively search and treat the possible causes of the disease. 2, drug treatment (1) antibiotics have infection factors can choose appropriate antibiotics. (2) antihistamines are suitable for simple purpura, can use rutin, vitamin C, calcium, aniloxin or haemostasis at the same time. (3) Aminophenone is effective in early use. (4) Glucocorticoids are suitable for severe skin damage or joint type, abdominal type, renal type purpura. (5) Immunosuppressants in patients with recalcitrant chronic nephritis, cyclophosphamide or azathioprine can be used. It can be used in combination with glucocorticoids. (6) Symptomatic treatment of fever and arthralgia can be used with antipyretic and analgesic drugs such as indomethacin and fenpropathrin; abdominal pain with scopolamine orally or intramuscularly, or atropine intramuscularly. (7) Other treatments have been reported to cure allergic purpura with cimetidine, compound salvia injection, rehmannia, dextran-40, dipyridamole, etc. respectively. 3, plasma replacement This method can effectively remove the immune complexes in the blood circulation, thus preventing vascular obstruction and infarction. It is suitable for abdominal and renal type patients who have a large amount of immune complexes in the plasma.