The Endoscopy Center has first-class medical technology and international advanced equipment, including cantilever system and Olympus’s latest endoscopic system. We especially focus on endoscopic diagnosis and treatment for early gastrointestinal cancer in current decade. Early diagnosis of GI tract caner is made by image enhanced endoscope or endoscopic ultrasound, then the early caner is removed through endoscopic mucosal resection or endoscopic submucosal dissection. The patient can recover fast without external wound after endoscopic surgery. The long term outcome is equivalent with conventional surgery. In addition, we develop diagnosis and treatment for esophageal motility disorders. After inflammatory and structural abnormalities are excluded by performing an esophagogastroduodenoscopy, high resolution esophageal manometry is performed to assess esophageal motor function. For the patients with Achalasia, who may be affected  their quality of life due to abnormal eating condition. Per-oral endoscopic myotomy(POEM) is a mininal invasive endoscopic surgery used to treat Achalasia. POEM can improve these patient's symptoms and also has efficacy for other esophageal moility disorders. The treatment effect is also comparable to or better than tranditional treatment.