介绍了Petri网理论的基本原理,分析了Petri网的技术特点,根据导弹技术保障的特点研究了模型建立的基本原则,建立了基于Petri网的保障能力评估模型. The basic principle of Petri net theory is introduced, the technical characteristics of Petri net are analyzed, the basic principle of model building is researched according to the characteristics of missile technology support, and the model of Petri net based security capability assessment is established.