Abstract: The sortie generation rate system is a complicated discrete event system. It is appropriate for Petri net theory to establish a model. This paper establishes the sortie generation rate model of multiaircrafts in the wartime applying the Petri net theory, and it uses coloured Petri nets （CPN） Tools software to simulate the process of maintaining and supporting in the grassroots level. Then, we lay special stress on the influence of the allocation of universal support equipments on the multiaircraft sortie generation rate, and regard the multiaircraft sortie generation rate as the optimal goal to obtain the most optimal allocation proportion of universal support equipments. The sensitivity of the influential factors of the multiaircraft sortie generation rate is analysed, and a case is used to prove the optimal allocation model. In that case, the model can provide effective support for combat units to optimize the number of support equipments.