Abstract: Objective: To discuss the clinical features of allergic purpura.Methods: Seventy-three patients with allergic purpura were analyzed retrospectively.Results: Of the 73 cases,47% of the allergic purpura occurred in February,March and April,and 30% in October,November and December.36% of the patients had a history of upper respiratory tract infection in the early days.47% of the cases presented abdominal pain,29% hematochezia,33% joint pain,14% hematuria and 34% proteinuria.The serum level of ALT was increased in 8% of patients and change of ECG was observed in 8% of the patients.Conclusions: Allergic purpura occurs more frequently in the spring and winter.Upper respiratory tract infection may be the common risk factor for the reoccurrence of allergic purpura,so treatment of upper respiratory tract infection should be emphasized.Gastrointestinal purpura with abdominal pain ahead of purpura should be distinguished from acute abdomen deceases.Arthritic purpura was often involved with symptoms of the knees or the ankles.Nephritis purpura was usually associated with proteinuria or hematuria,so routine urine detection should be conducted.