After loosening the adhesions，dissect the gastrocolic ligament，the right side to the hepatic flexure of the colon. Under the pylorus，isolate and cut the right gastroepiploic vessel，and dissect the No. 6 lymph nodes. Expose the hepatoduodenal ligament and remove the No.12a lymph nodes. Open the lesser omentum up to the right side of the cardia. Ligate and dissect the right gastric vessel and dissect the No.5 lymph nodes. Fully isolate and dissect the duodenum. Seek the common hepatic artery along the gastroduodenal artery and remove group No.8a lymph nodes. At the superior margin of the pancreas，the No.11p lymph nodes were cleared along the splenic artery. Separate and cut the left gastric vessels to complete the No.7 and No.9 lymph node dissection. The lymph nodes of No.1 and No.3 were dissected along the anterior and posterior walls of the gastric minor curvature from the middle of the gastric body to the cephalad and right side，respectively. Uncover and cut the left gastroepiploic vessel，remove the lymph nodes at its root，and expose the gastric wall of the greater curvature to remove the No.4sb and No.4d lymph nodes，and then complete the D2 lymph node dissection. Reconstruction of the digestive tract was performed by Billroth Ⅱ anastomosis + Braun anastomosis.