The existing performance evaluation methods of worm attack strategies (defense strategies) are not considered defense strategies (attack strategies) change’s influence on attack strategies (defense strategies) and performance evaluation of defense strategies are ignoring the implementation cost. In view of this situation, a performance evaluation model based on static Bayesian game (PEM-SBG) is proposed, and the performance evaluation methods of worm attack and defense mechanisms are presented. The performance evaluation method of defense mechanisms is based on gray multiple attributes theory and considers several evaluation metrics about cost and utility, so the evaluation process is much more comprehensive. Finally, the paper uses simulation tools SSFNet to implement simulation experiments under different attack and defense scenarios and validate the method.