Abstract: Adenocarcinoma of esophagogastric junction (AEG) is the adenocarcinoma locating at the junction of the lower esophagus and gastric cardia. In recent years, the incidence of AEG has shown an upward trend and has attracted more and more attention. Because of its special biological behavior, there are still many controversies in the definition and principles of surgical treatment of AEG. At present, many consensuses have been reached on classification, staging, surgical approach, resection range, lymph node dissection and other related surgical fields of AEG, leading to a series of normative guidelines published. However, due to the particularity of the anatomical location of Siewert Ⅱ AEG, the complexity in tumor biological behaviors such as tumor infiltration range and lymph node metastasis pathway brings certain difficulties to treatment decisions, surgical methods, and resection ranges. With the tremendous development of minimally invasive surgical techniques, laparoscopy and thoracoscopy and other minimally invasive surgical techniques have been widely used in the treatment of malignant tumors in both abdomen and thorax. The minimally invasive treatment of Siewert Ⅱ AEG had also be further standardized and promoted. Under this circumstance, the Chinese Society of Laparoscopic and Endoscopic Surgery in Chinese Surgical Society of Chinese Medical Association organized experts to formulate the "Chinese Expert Consensus on Endoscopic Surgery for Siewert Ⅱ Adenocarcinoma of Esophagogastric Junction (2019 Edition)". In recent years, with the advancement of surgical technology, high-quality clinical researches have been carried out constantly, which has further promoted the continuous updating of clinical research and evidence-based medecine. The endoscopic surgery for Siewert Ⅱ AEG is also continuously optimized. Based on evidence of the latest clinical research, guidelines, and consensus, the 2019 edition of the consensus is updated and revised. After discussion and revision by the expert group, the "Chinese Expert Consensus on Endoscopic Surgery for Siewert Ⅱ Adenocarcinoma of Esophagogastric Junction (2023 Edition)" has been finally formed, in order to guide the clinical practice of minimally invasive surgical treatment of Siewert Ⅱ AEG.