From the point of message transmission and processing, this paper puts forward a new disjoint Minimal Path sets (MPs) algorithm to get the disjoint MPs of networks and trys to realize it by means of Discrete Events Simulation (DES). In the new method, the arcs of CoA network are regarded as processing units, nodes as storage units, and network as message transmission network. Taking SimEvents ® as the platform, the modeling idea of nodes, arcs and message transmission network are described in detail. An example verifies the correctness of the processing rules and the feasibility of using DES to generate the disjoint MPs automatically.