The etiology of acute pancreatitis is unknown in 2% to 30% of patients clinically, and only symptomatic and supportive treatment is available for such patients, so a significant proportion of patients have recurrent attacks, called recurrent idiopathic pancreatitis (RIP). The aim of this project is to develop clinically individualized treatment plans for patients with RIP based on different etiologies. More and more patients with pancreatitis will benefit from the establishment of norms for the diagnosis and treatment of recurrent pancreatitis in general hospitals to reduce the recurrence rate of pancreatitis. Studies have shown that after the non-invasive evaluation to find the cause of acute pancreatitis, endoscopic retrograde cholangiopancreatography (ERCP) can reveal the cause in about 70-90% of the remaining patients. This program provides detailed diagnosis and treatment for patients with recurrent pancreatitis, including history taking, alcohol intake, laboratory tests and imaging aids, excluding metabolic factors (hyperlipidemia, hypercalcemia, etc.) or biliary pancreatitis with positive gallstones, and in cases where the cause is still not clear from the above non-invasive tests, ERCP examinations and related diagnostic operations are performed, and based on the comprehensive results Individualized treatment plan, i.e., minimally invasive endoscopic treatment plan, is formulated, and the efficacy and follow-up prognosis and recurrence are observed. At the same time of ERCP examination, multiple diagnostic techniques are integrated to perform the examination: 1. Endoscopic manifestations: papillary morphology, parapapillary diverticulum and relationship with papillary opening. 2.Cholangiopancreatography imaging: transverse diameter of bile and pancreatic ducts, presence of bile-pancreatic duct stones, bile-pancreatic duct stenosis, and judgment of congenital variants (such as pancreatic splitting, abnormal confluence of pancreatic and bile ducts, etc.). 3.Microscopic examination for bile analysis: record the bile duct microstones. 4.Intra-biliary ultrasound (IDUS): to explore microstones in the bile duct and to make a judgment on the nature of stenotic lesions. 5.Sphincter of Oddi manometry: recording the basal pressure and amplitude of the bile duct and pancreatic duct sphincter. Through the integration and implementation of the above diagnostic techniques, a comprehensive judgment of the etiology of RIP patients can be made and individualized treatment plans can be formulated. Eventually, it can also provide reliable clinical epidemiological data for the etiological study of RIP in the northern region of China. Although the results of domestic and international studies have shown the superiority of ERCP and related techniques in the diagnosis and treatment of RIP, at this stage, there is a lack of epidemiological studies on the etiology of recurrent disease in China, especially in Beijing, and more importantly, there are currently no unified and standardized criteria for the diagnosis and endoscopic interventional treatment of recurrent disease in China, which are mainly reflected in the fact that most general hospitals have not yet established ERCP-related diagnostic and treatment technologies: such as bile analysis, Oddi sphincter manometry, biliopancreatic duct internal ultrasound, etc. At present, there are no unified and standardized criteria for the diagnosis and endoscopic intervention of RIP in China, including: (1) differences in treatment methods for the same etiology. (2) Differences in endoscopic treatment techniques: whether the bile duct or pancreatic duct sphincter is incised, and the choice of incision size. Indications for pancreatic duct stent application, selection of pancreatic duct stent and timing of placement. Therefore, it is particularly important to develop a standardized etiological diagnosis system for recurrent pancreatitis and to establish an individualized treatment plan for recurrent pancreatitis. The innovation of this project lies in the integration of several diagnostic techniques in the process of performing ERCP for patients with recurrent pancreatitis to immediately establish the etiology of recurrent pancreatitis, which can not only obtain epidemiological findings on the etiology of recurrent pancreatitis in Beijing, but also develop a guideline diagnosis and treatment procedure in clinical practice and standardize various individualized therapeutic ERCP operations for different etiologies. In addition, it is possible to develop guidelines for the diagnosis and treatment of recurrent pancreatitis in clinical practice, to standardize the individualized therapeutic ERCP operations for different etiologies, and to improve the etiological diagnosis rate of patients with acute pancreatitis and the long-term efficacy of effective prevention of recurrence, so as to further minimize the incidence of post-ERCP complications and reduce the recurrence rate of acute pancreatitis. The diagnosis and treatment system of recurrent pancreatitis is the specialty of our department and has reached the advanced level at home and abroad. As early as 2006, our department started the diagnosis and treatment of recurrent idiopathic pancreatitis, and has successfully performed nearly 100 cases of diagnosis and treatment of recurrent pancreatitis under ERCP, and has published papers. It has already made many patients come to seek treatment, bringing more patients and increasing the benefits for the department and hospital. The brand effect is achieved so that the patients benefit, the department benefits, the hospital benefits and the medical insurance benefits.