Purpose: To observe the effect of Xiaoban Yushen Decoction (XBYSD) on anaphylaetic purpura nephritis(APN) and humoral immunity.Method: Dividing HSN into nephritis and nephropathy; and using XBYST of pure traditional Chinese medicine to contrast nephritis A, prednisone and hydrocortis on or cortisol to contrast B; XBYSD, prednisone and cyclophosphamide to C; prednisone and cyclophosphamide to D. I use single proliferation to measure the IgG, lgA, igM, C3, C4, B level of the healthy infant and that of the patient. Result: nephritis A (41 cases), 36 cases are cured and the cure rate is 97. 56%, which is higher than B (15 cases) 6cases are cured, the cure rate is 80% (P<0.05). C (15 cases), 9 cases are cured, the cure rate is 93.3%, which is higher than that of D (10 cases), 4 are cured, the cure rate is 60% ( p |