Abstract: Objective To improve the ability of diagnosis and treatment, a study was carried out to summarize the epidemiological characteristics, clinical manifestations and diagnosis of experience of autoimmune pancreatitis (AIP). Methods This study retrospectively analyzed the clinical data of all the patients diagnosed with AIP from January 1998 to December 2016 in the ward of Peking union medical college hospital. Results 194 type 1 AIP patients were enrolled in this study. The M/F ratio of the disease was 3.51:1, with an average age of 57 + 15 years. The most common symptom is jaundice, abdominal pain and weight loss. The most common diseases of the pancreas are sclerosing cholangitis, salivary glands, IgG4 nephropathy. There are 36.68 percent of AIP patients with diabetes mellitus. IgG4, ANA, ESR, c-reactive protein and CA199 are all contribute to disease diagnosis and follow-up. Pathology, pet - CT and hormone therapy response all contribute to the diagnosis of AIP. Conclusions The incidence of AIP in China is increasing gradually. As a systemic disease, the type 1 AIP has special clinical features and laboratory examination features. The diagnosis of AIP can be applied in many ways.

Key words: Key word: chronic pancreatitis, autoimmune pancreatitis, type 2 autoimmune pancreatitis , type 1 autoimmune pancreatitis, the pancreatic neoplasm