The ercp biliary stent is a minimally invasive surgical procedure for placing a biliary stent during endoscopic retrograde cholangiopancreatography. The so-called ercp is the gold standard technique for diagnosing choledochal stones by using a duodenoscope to pass through the esophagus, stomach, and duodenum through the opening of the large papilla, from which it goes in to show diseases of the bile ducts and pancreatic ducts, including bile duct tumors, pancreatic duct tumors, pancreatic duct stones, and choledocholithiasis through angiography. Biliary stent is usually used for patients with narrowing of bile duct, after narrowing the bile can’t flow out, placing biliary stent is a kind of endoscopic operation, put the stent into the bile duct to support the narrowing and establish a channel for bile to flow out so that bile can flow into the intestine to play a role, this kind of operation is less traumatic and has good effect. It is recommended that patients with the above conditions should go to regular hospitals in time to avoid delays.