Objective:To investigate the open method(OC) and laparoscopic cholecystectomy (LC) after bile duct dilation incidence of contrast.Methods:collected from 2006 December to 2014 December in the department of hepatobiliary surgery requires 412 patients underwent cholecystectomypatients hospitalized with cholecystolithiasis,chronic cholecystitis,gallbladderpolyps,were randomly divided into LC group and OC group,LC group of 207 cases,205 cases in OC group,and were respectively treated with LC and OC.Start regular follow-up after a month,the comparison of 2 surgical operation time,blood loss and postoperative application of antibiotics time,anus exhaust time,eating time and hospitalization time.And to observe the two groups the incidence of patients after bile duct dilatation in follow-up after operation.Results:207 cases of LC patients were 89 patients had bile duct dilation,205 cases of OC patients were 41 patients had bile ductdilation,statistically significant differences between the two groups (P＜0.05).In group LC,the diameter of common bile duct in operation half months began to increase,the increase continued until 3 months after operation.After 3 months of little change in the diameter of common bile duct.The averagepreoperative bile duct diameter is 5.3 mm,after 6.1 mm,there was significant difference(P＜0.01).Conclusion:LC is a safe and reliable operation method,Identifying cause dilatation of common bile duct after LC operation and attention as soon as possible to give the corresponding prevention and treatment,further can reduce complications occur.