Objective To investigate the relationship between lymphadenectomy and the prognosis of endometrioid adenocarcinoma.Methods Eighty-six cases of endometrioid adenocarcinoma patients who got a clear diagnosis and accepted system surgical treatment and had complete follow-up data were collected in this study.Fifty-eight cases routined lymphadenectomy (lymphadectomy group),and 28 cases didn't routine lymphadenectomy (without lymphadectomy group).The relationship between related pathological features and lympha node dissection state were evaluated by univariate analysis,and through survival analysis to understand the relationship between lymphadenectomy and the prognosis of endometrioid adenocarcinoma.Results The 3-years disease-specific survival rate (DSS) in lymphadectomy group and without lymphadectomy group were 82.1％ and 61.8％,which reached statistical significance (P =0.006).The 3-year DSS of FIGO Ⅰ A stage in lymphadectomy group and without lymphadectomy group were 93.8％ and 95.7％ (P=0.704),the 3-year DSS of FIGO Ⅰ B-Ⅳ stage in lymphadectomy group and without lymphadectomy group were 49.1％ and 35.4％,which reached statistical significance (P =0.044).Correlation analysis results showed that FIGO stage late (≥ Ⅰ B stage),higher tumor grade (G2-3 grade) were independent poor prognosis factors of 3-year DSS,and lymphadenectomy was an independent good prognosis factor.Conclusion Lymphadectomy can improve the prognosis of endometrioid adenocarcinoma patients who are FIGO Ⅰ B-Ⅳ stage,has therapeutic significance.