This paper puts forward that capital structure is affected by cost of capital?risk?the agin ability? and the ability of capital value preserved and added, several factors, of and at the same time the authors analyzes them by approaching the limitation of regarding the weighted average cost of capital as the optimal standard of capital structure in the traditional capital structure decision-making method. Therefore multiobjective-programming method is applied in the capital structure to establish the target function and its subjection equations. Furthermore , this article shows its application.