Bi-II gastric dissection is one of the more classic partial gastrectomy surgeries. In partial gastrectomy, in addition to the removal of the diseased stomach, reconstruction of the gastrointestinal tract is also required, and the reconstruction is divided into Bi-I and Bi-II. The difference between them is that Bi-I is anastomosis of the stomach and duodenum for reconstruction, which is mostly used for gastric ulcer, partial gastrectomy or duodenal ulcer, and vagotomy after such surgery. It is mostly used in the treatment of duodenal ulcer, and the anastomosis is mainly in the anterior or posterior part of the colonic ligament, and the anastomosis is either full or half. The main indications of Bi-direction are, firstly, malignant tumor of the gastric sinus can be done in Bi-direction. Secondly, duodenal ulcers and gastric ulcers can be treated with pyloric and pre-pyloric ulcers, and vagotomy can be performed. If the tumor of gastric cancer is mainly located in the fundus or the body of the stomach, and the malignancy is higher, total gastrectomy is usually used.