As the existing generalized yield function of box section is non- homogeneous,the ultimate bearing capacityof structures with box section obtained by elastic modulus adjustment procedures is often affected by the initial load,and the calculation accuracy is not satisfactory.In order to solve this problem,a homogeneous generalized yieldfunction is developed for box section,and the order of the polynomial expression is determined through error analysis.Then,the element bearing ratio (EBR),the EBR uniformity and the reference EBR for box section are defined,and an elastic modulus adjustment strategy that takes EBR as the basic parameter is proposed.Moreover,an elasticmodulus reduction method for the analysis of ultimate bearing capacity of the structures with box section is presen-ted,and some numerical examples are used to verify the correctness of the method.The results show that the pro-posed method helps to eliminate the effect of the initial load and possesses high calculation accuracy and strong iter-ation stability.