For Roux-en-Y gastrojejunostomy after subtotal gastrectomy, the width of reconstruction gastric tube was a key factor to predicate prognosis, and it often ranges from 3 cm to 6 cm, without universal standard. Narrow gastric tube may lack enough blood supply, as a result, it increase the rate of anastomotic leakage. On the contrary, wide gastric tube takes up much thoracic capacity which may disturb the normal pulmonary and cardiovascular function. Tabira and his colleagues conduct a prospective trail that proves the width of gastric tube has no relevance to local blood supply, anastomotic leakage and postoperative nutrition, but the study lack enough patients which may increase bias. So, there is no reliable evidence to predict the quality of postoperative life.