Abstract: Objectives To analysis clinical pathology of organ specific IgA vasculitis (IgA nephropathy) and systemic IgA vasculitis (allergic purpura) of purpura nephritis in children. Methods Clinical and pathological data of hospitalized pediatric patients of IgA nephropathy and purpura nephritis were retrospectively analyzed from June 1993 to November 2014. Results There were 405 patients of IgA nephropathy (256 males and 149 females). The ratio of male to female was 1.7:1. The average age was 10.2±2.8 years. The nephrotic syndrome (31.6%) was the most common clinical type, followed by hematuria and proteinuria (27.9%). There were 548 patients of purpura nephritis, 329 males and 219 females. The ratio of male to female was 1.5:1. The average age was 10.2±3.1 years. The hematuria and proteinuria (61.6%) was the most common clinical type, followed by nephrotic syndrome (21.4%). None of the IgA nephropathy progressed to systemic vasculitis (allergic purpura). Conclusions The causes, onset ages and clinical manifestations of IgA nephropathy and allergic purpura may be consistent or overlap, but none of IgA nephropathy (organ specificity IgA vasculitis) progressed to allergic purpura (systemic IgA vasculitis). IgA nephropathy might have more renal immune disorder mechanisms involved in its pathogenesis.