Contray to advanced cases, post-operative 5 year survival rate of early gastric cancer is extremely high (95.5% in Japan). To detect early gastric cancer, double contrast study of the stomach is one of essential methods including endoscopic examination. Since 1973, there has been detected 15 cases of early gastric cancer with double contrast study at Seoul National University Hospital. Among 15 cases, 6 cases were analized with double contrast study. endoscopic examination, microscopic examination of resected specimen and pathological mapping using multiple serial sections. Conclusion are as follows. 1) Double contrast study is most important method in detection and evaluation of early gastric cancer. 2) With double contrast study one can predict macroscopic finding as well as pathological mapping. 3) Without pathological mapping the final diagnosis of early gastric cancer should not be made. 4) Radiological diagnosis of early gastric cancer should be qualitative.