Fertilization rate and planting density are important factors affecting soybean yield.A large number of soybean [Glycine max(L.)Merr]field experimental data(1998～2017)werecollected，the rate of optimum nitrogen(N)，phosphorus(P)，potassium(K)fertilizers and planting density were analyzed based on fitting quadratic function.Theeffect of fertilizer rates and planting density on soybean yield were analyzed by stepwise regressionanalysis.Results showedthat the yield of spring and summer soybeans gradually increased overyear，with average yield of 2 610 and 2 724 kg/hm²，respectively.The optimum rate ofN，P and K fertilizers for the highest yield of summer soybean was N 96 kg/hm²，P2O5 80 kg/hm² and K2O 126 kg/hm²，and the optimum rate ofN，P and K fertilizers for the highest yield of spring soybean was N 71 kg/hm²，P2O5 108 kg/hm² and K2O 74 kg/hm²，respectively.The optimum planting density was 27×10 4 and 34×104 plants/ hm²under the highest yield for summer and spring soybeans，respectively.Stepwise regression analysis showed that the Pfertilizer had the greatest influence on the yield of spring soybean followed by K fertilizer and plantingdensity.For summersoybeancrop，planting density had the major effect on yield followed by Pfertilizer.Overall，the P fertilization and plantingdensity were critical for soybeanproduction，the planting density need be enhanced to attain high yield for spring and summersoybeans with enhancement in phosphorus fertilizer in bothseasons.