Aiming at the rationality of air defense group decision structure, use Petri net method to carry out modeling analysis for air defense group command information structure. Based on command information process, combine command information structure model of basic decision unit and air defense group command structure, analyze time delay, information flow path and maximal flow ration. The result shows that the method can acquire air defense group Petri net model under level command system, and provide reference for air defense group decision structure and completion.