Study of Abdominal Drainage in LCBDE+PC

Inclusion Criteria: * cholecystocholedocholithiasis or simple choledocholithiasis, no intrahepatic bile duct stones, bile duct diameter greater than 8 mm; * no acute suppurative cholangitis or severe acute biliary pancreatitis; * all patients were treated with internal medicine before operation, such as anti inflammation, liver protection, correction of anemia, hypoproteinemia, disturbance of electrolyte and acid-base imbalance; * there was no obvious stenosis of common bile duct; * aged from 18 to 80 years; * BMI\<30 kg / m2; * American Society of anesthesiologists (ASA) anesthesia risk rating of 1 or 2. Exclusion Criteria: * severe anemia or thrombocytopenia in patients with 50\*109/L, PT is greater than 15s and can not correct the coagulation disorders; * severe heart and lung complications can not tolerate pneumoperitoneum and other laparoscopic surgery contraindications; * IgG4 associated cholangitis and other immune system diseases; * there is a serious systemic disease. The patients with the following conditions: * there was inflammatory stenosis or Oddi sphincter hyperemia and edema at the lower end of the common bile duct; * in acute inflammation in patients with obstructive jaundice, such patients have biliary dilatation, the bile duct wall edema obviously and easily with bile duct opening at the lower end of the inflammatory edema, biliary high pressure, suture of bile duct after prone to bile leakage; * the presence of severe cholangitis requiring emergency biliary drainage; * it is difficult to get a combination of intrahepatic bile duct stones and choledochoscopy; * Mirizzi syndrome type II-IV.