Objective:To study the correlation of the ratio and number of involved lymph nodes and the prognosis of gastric carcinoma.Methods: 174 patients of positive gastric lymph nodes were included.They were treated by radical gastrectomy and lymph nodes dissection(D 2 or D 3)in our department.The ratio and number of metastastic gastric lymph nodes were calculated.Their influence and their interrelation with pathogenic parameters were analyzed.Results: The overall 5-year survival rate was 29.6%,and the five-year survival rate of 1～20 per cent and more than 20% were 70.6%,12.0% respectively.One to five positive lymph nodes and five more were 46.6%,17.4% respectively.The five-year survival rate was decreased as the ratio and number of involved lymph nodes increased.Studies also indicated that with the increase of depth of cancer invasion,the ratio and number of involved lymph node elevated.Conclusion: The results shows that the ratio and number of involved lymph nodes correlated to tumour progression and the five survival rate.Perigastric lymph node status can be considered as a simple and effective prognosis factor.