 3. The five doctors who accepted the TTT do the gastroendoscopy in accordance with the TTT content for the T1 period,.1 the patients name, 2gender, 3age,4past medical history HP, gastritis, gastric ulcer, oral drug operation, etc.,5gastroscope operation time,6the location of the lesion- longitudinal upper, middle and lower,7 the location of the lesion -circumferential lessor curvature, Greater curvature, anterior wall, posterior wall,8 lesion size, 9conventional white-light imaging red, white, no change, 10EM-NBI VS type boundaries, microvascular pattern and microsurface pattern; dont do it, 11microscopy types uplift type, flat type, concave type or IIc IIIa or IIb, 12histological type differentiated and undifferentiated type and 13 pathological low grade neoplasia, high-level neoplasia etc.. For the treatment of ESD patients, further pathological results were recorded after ESD, including the pathology, edge and basal conditions. The other five doctors do the gastroendoscopy as they do before. 300 cases person 