(a) General typing: 1. Early gastric cancer cancer tissue is limited to the mucosal and submucosal layers regardless of whether there are lymph node metastases or not is called early gastric cancer and its typing is simplified to three types: elevated, flat, and depressed micro gastric cancer early gastric cancer initiation stage 12.5px in diameter under gastric cancer micro gastric cancer 0.6~25px gastric cancer small gastric cancer is collectively called micro gastric cancer gastric mucosal biopsy disease diagnosis of gastric cancer and surgical resection specimens by pathological segmental continuity. Histopathological examination of the section fails to detect cancerous tissues called point cancer, which is usually recognized as a special rare manifestation of micro gastric cancer. 2. Progressive gastric cancer is also called progressive gastric cancer when the cancerous tissues infiltrate into the muscular layer or plasma layer, which is also called advanced gastric cancer, and generally the cancerous tissues infiltrate into the muscular layer, which is called super muscular layer, which is called advanced gastric cancer. type, mixed type, and multiple carcinomas. (2) Histological classification This classification is mainly divided into common type and special type according to the tissue structure, cell shape and differentiation degree of cancer. The common types are papillary adenocarcinoma, tubular adenocarcinoma, hypofractionated adenocarcinoma, mucinous adenocarcinoma, and indolent cell carcinoma. 2. Special types are adenosquamous carcinoma, squamous carcinoma, carcinoid carcinoma, undifferentiated carcinoma, and gastric ulcer carcinoma. 3. The study showed that the intestinal type is more differentiated and is more likely to be malignant in the elderly, while the diffuse type has a better prognosis.