Abstract: Centering on the best choice among various solutions to the feasibility study of freeway projects in China,this paper,on the basis of analysing the effects of the construction solutions of freeways,has established a practical model of comprehensive evaluating system by adopting the method of goal decomposition.In order to avoid fuzziness of indication weight of construction matris by adopting the method of AHP,an improved method of three-mark AHP is introduced in this paper.The widely used arithmetic introduced will surely make the decision-making in the feasibility study of the freeway more criterions and more scientific. The widely used arithmetic introduced will surely make the decision-making in the feasibility study of the freeway more criterions and more scientific.