Abstract:Objective：To study the factors involved in the development of internal abdominal hernia after subtotal gastrectomy and gastrojejunostomy(Billroth II gastrectomy), and the means for their prevention and for decrease of mortality rate.Methods：The clinical datas of 34 cases of internal abdominal hernia occurred after gastrectomy were analyzed retrospectively. Results：All of the 34 cases of internal abdominal hernia developed after Billroth-II operation(26 cases after Eiselsberg operation and 8 cases after Moynihan anastomosis). The time of onset was from 1 month to 21 years after operation, and in 28 cases was during the first year after operation(82.4%).The chief complaint was sudden epigastric pain with radiation of pain to the back. The preoperative misdiagnostic rate was 82.3%. All cases were treated by operation. The postoperative mortality rate was 29.4%.Conclusions：Internal abdominal hernia is a serious complication of Billroth-II operation. Patients who present with symptoms of intestinal obstruction after Billroth-II operation should be considered to have internal abdominal hernia.The only key to decrease mortality rate is operative treatment as soon as possible.