This article has deeply studied the two kinds of computer software legal protection policies ISO17799 and ISO13355, and analyzed the conceptual model and relational model of the multiple game. On this basis, the concept of computer-aided evaluation based on computer law is proposed, and a computer-aided evaluation system is designed, which effectively realizes asset evaluation based on multiple games and threat and vulnerability evaluation based on probability statistics. And on the basis of referring to the risk assessment process and based on the actual needs of the system, a highly operable assessment process that is convenient for computer implementation is proposed.