Endoscopic implantation of plastic or covered metal stents is widely used in a variety of benign pancreaticobiliary diseases, including duct stricture, large or difficult stones, bile or pancreatic juice leak, etc. There are some late-stage adverse events after stent insertion, such as stent occlusion, proximal or distal migration, secondary duct injury and failure of stent removal, etc. The longer the stents were inserted, more likely the adverse events would happen.