In order to solve the problem that the failure of the long-distance rocket weapon equipment can not be effectively analyzed and eliminated, the fault is simulated. The mechanism of equipment failure in far fire weapon system is analyzed. According to its characteristics and propagation characteristics, the mechanism model and related database describing the fault properties of far fire are constructed by using the methods of fault mechanism modeling and semi physical simulation. The propagation characteristics of the fault are analyzed by artificial neural network algorithm, and the simulation experiments are carried out through examples. The simulation results show that the research provides a technical guidance for the maintenance training of the far fire weapon system, and has certain practical significance.