With the latest endoscopic narrow-band imaging (NBI) mainframe in place and applied, the endoscopy center of our hospital has established a perfect system for early gastric cancer diagnosis and treatment. The so-called Narrow Band Imaging (NBI), which has been put into clinical application internationally only in the past two years, is an optical image emphasis technique that optimizes the central wavelength to 415nm and 540nm and narrows its spectral range to emphasize the vascularity of the mucosal surface, the fine structure of the mucosa and the capillary concentration area in order to observe the light strongly absorbed by the blood and the strongly reflected and scattered light on the mucosal surface. The NBI technique enables observation of the mucosal surface layer in high contrast, especially the fine structures that are important for the diagnosis of early gastric cancer. When patients visit the endoscopy center, patients with suspected early gastric cancer need to undergo stained magnification endoscopy and NBI endoscopy to determine the size of the lesion, give a pathological diagnosis of mucosal biopsy, and apply the C-13 breath test to determine whether H. pylori infection is present. When the diagnosis of gastric cancer was confirmed, ultrasound endoscopy was performed to clarify the stage of tumor infiltration and perigastric lymph node metastasis, and a multidisciplinary discussion was held to formulate a plan in combination with CT results. Patients with lesions invading only the mucosal layer (low-differentiated ulcerated adenocarcinoma should be less than 2 cm in diameter) and without lymph node metastasis can be treated radically by endoscopic submucosal dissection (ESD) without opening the abdomen. In the past two years, Dr. Zhang Jichang and Dr. Wu Qi of the Endoscopy Center have performed nearly 20 cases of submucosal dissection for early gastric cancer and have continued to follow up regularly with remarkable results, with the longest period of 22 months without recurrence. With the increasing medical awareness of the public and the large amount of government investment in medical care, early diagnosis and treatment of cancer has been increasingly emphasized. With the strong support from the hospital leadership and assistance from sister departments, the Endoscopy Center, relying on the advantageous platform of gastrointestinal tumor, will definitely reach the leading level in the treatment of early gastric cancer.