Through 30 typical cases, the book systematically shows the diagnosis and treatment of esophageal and gastric malignant tumors. Each case is discussed according to the medical history, medical history analysis, diagnosis, treatment plan determination, and postoperative pathology, also combined with expert's brilliant comments. The book is equipped with a large number of endoscopic and pathological pictures, which makes it easier to understand. The extended reading attached to the case introduces classic academic theories and research frontiers at home and abroad, so that different levels of digestive physicians and digestive endoscopy practitioners can learn the standard methods of endoscopic diagnosis and treatment plan.