Abstract： Autoimmune pancreatitis (AIP) is a rare and special type of chronic pancreatitis,which was earlier referred to as lymphoplasmacytic sclerosing pancreatitis (LPSP),idiopathic duct destructive pancreatitis,or granulocyte epithelial lesion-positive pancreatitis.The concept of AIP was not coined by Yoshida until 1995.1 Although AIP was initially reported in Japan,USA and Europe,AIP cases have increased rapidly in China in the last few years.According to statistics,AIP accounts for 2.2％-2.4％ of pancreatectomy and 19.5％-28.0％ of benign pancreatic operation.2 Because AIP is induced by autoimmune mechanism,oral steroid therapy is usually effective and most of the time operation is unnecessary.In order to deepen our understanding about the diagnosis and treatment of AIP,to reduce the chances of unwanted operation,we retrospectively analyzed AIP cases admitted to our hospital in the recent years.