Abstract: There are few papers to study IT application decisions based on game theory. This study proves existence and uniqueness of the pure-strategic Nash Equilibrium of nfirms'following three-stage game: in the first stage,the enterprise decides IT adoption level M_i;in the second stage,the enterprise decides the level of resources allocated to IT implementation k_i;in the last stage,the enterprise decides its own product quantity q_i,to participate in Cournot product quantity competition. Then at the state of Nash Equilibrium the relevant factors relationship is analyzed. The results show that:the adop donmotivation on the level of resources allocated to IT implementation,the level of resources allocated to IT implementation on IT application performance exist positive effect significantly;the adoption level on the level of resources allocated to IT implementation,the adoption motivation on IT application performance exist negative effect significantly.

Key words: pure-strategic Nash Equilibrium solution, the enterprise precondition, the adoption motivation, the adoption level, the level of resources allocated to IT implementation, IT application performance