Gastric body IIb+IIa lesions are superficial flat and superficial elevated lesions in the mucosa or submucosa of the gastric body of the stomach. When IIb+IIa lesions appear in the gastric body, it indicates early gastric cancer. Early gastric cancer means that the lesion only occurs in the mucosa or submucosa. According to the morphology of the lesion, it can be divided into three types: type I is elevated type, which refers to the lesion tissue protruding into the lumen of the stomach; type II is superficial type, the lesion tissue of this type is relatively flat without some obvious elevations and depressions; and type III is depressed type, and the lesion tissue manifests itself as a deeper ulcer. Among them, type II early gastric cancer can be divided into three subtypes, namely IIa superficial elevated type, IIb superficial flat type and IIc superficial depressed type. Early gastric cancer can be treated by endoscopy: generally, early gastric cancer can be treated by gastric mucosal resection or submucosal dissection under endoscopy. For early gastric cancer whose tumor infiltration depth reaches the submucosal layer, or which cannot be completely resected and may have lymphatic metastasis, it should not be treated blindly by endoscopic treatment, but should be treated by standard radical surgical operation.