According to the genetic model of additive-dominance and its interactions with environments,seven agronomic traits in two environments were analyzed with six inbred lines and their nine F₁ hybrids of oil sunflower.The results showed,additive and dominance effects were the major genetic component for plant height,stem diameter,disc diameter,100-GW,kernel percentage and GW per disk.Fertile percentage was mainly controlled by additive effects and dominance×environment interaction effects.Additive effects,dominance effects,and dominance×environment interaction effects played a major role for kernel percentage and GW per disk.The analysis of correlation among agronomic traits indicated that additive correlations were predominance in genetic correlations for most pairs of traits.Farther,the study also indicated that the contribution of additive variance of 100-GW to oil content of seeds was larger than other agronomic traits.The largest contribution of dominant variance to oil content of seeds was due to the fertile percentage.And the largest contribution of additive×environment interaction effects to oil content of seeds was due to the GW per disk.