77 patients with EGC or HGD were peformed ESD, showed that the rate of curative treament was 98, 7% the average time of ESD procedure was 86.7 mins; factors related to the longer procedure time were location (antrum vs body of the stomach, 76.7 vs 112, 4 mins, respectively, p=0.05), the size of the tumor (<30 mm vs 30 - 50 mm, 67.3 vs 115.7 mins, respectively, p<0.05); bleeding during procedure time was common complication, 32, 5%); perforationwas had 1 case but no need surgery.