Multi paths fault propagation model for network modeled system

In order to prioritize the facilitate maintenance and inspection plan, fault propagation paths of large complex systems is researched. By network modeled for large-scale system, the state equation of the network vertices is established. According to the failure information of network vertices, an improved petri nets combined with a directed graph theory is used to observe state transfer by established equation. When state of network vertices transfers, the state equation generates all possible probabilities of fault propagation paths. Finally, a numerical example is given to illustrate rationality.