Objective To summarize the research progress of the adenocarcinoma of esophago-gastric junction (AEG) in recent years, in order to improve the further understanding of this disease. Method The literatures about application and research progress of AEG were researched and reviewed. Results Siewert classification was a widely recognized classification for AEG, according to this classification, AEG was divided into typeⅠ, Ⅱ, and Ⅲ. Gastroesophageal reflux, Barrett’ sesophagus, and the infection of Helicobacter pylori may be the important pathogenic factors. For SiewertⅠAEG, thoracic approach was preferred commonly, and for SiewertⅡand Ⅲ AEG, total gastrectomy through abdominal approach and distal partial resection of esophagus through diaphragmatic hiatus approach were recommended. Endoscopic submucosal resection, neoadjuvant therapy, targeted therapy, and multidisciplinary team were becoming more and more important in the treatment of AEG. Conclusions The choice of surgical method and resection range should according to the types of AEG. Comprehensive assessment and comprehensive treatment would be performed, so that effect of treatment may be improved.