Soybean yield were improved by genetic improvement,meanwhile,some agronomic traits were changed largely.Yield of soybean were increased with year it was released and it were influenced by pods and seeds number per plant.Plant leaf area was increased with years,fat content of seeds were increased as the protein content reduced.Plant height should not be reduced and keep at 0.8m.Otherwise,it may become a limited factor to influence yield of soybean.So,it is of value to further the study of relation between some agronomic traits and yield of soybean,for it will guide the breeding of excellent cultivars of soybean and improving cultivation of high-yield soybean.