30 patients(18-75Y/O) of pancreatic head, duodenal or common bile duct tumor which need Whipple procedurewhich are operable according to the preoperative imaging studies will be recruited for this studyand will be randomized by Randlist software into 2 equal groups.The control group will be undergone the standard Whipple procedure. In the intervention group a Braun jejunojejunostomy will be added to the standard procedure.Those who are inoperable according to intraoperative findings or those who die during the operation will be excluded from the study.The following variables will be collected by a questionnaire to compare between the two groups:age, gender, body mass index, time from the first symptoms till the operation, cause of the disease ( pancreatic head,or duodenal, or common bile duct tumor), duration of the operation, intraoperative bleeding, total volume of intraoperative blood product transfusion, pre- and postoperative lab data (WBC, Hb, ALT, AST, Total and direct bilirubin) in days 1, 3, 5, 7 and 14, volume of nasogastric tube evacuations for 48 hours after the operation, daily number of vomitings after extraction of nasogastric tubes, postoperative complications including death and its cause, pancreatic anastomosis leakage, gastric anastomosis leakage, biliary anastomosis leakage, postoperative bleeding which needs another operation, postoperative gastrointestinal bleeding which needs repeat operation, afferent loop syndrome, delayed gastric emptying,surgical site infection, pulmonary infection, confirmed deep vein thrombosis. Follow-up of the patients will be continued till 1 month after the operation or in-hospital death.