With the application of the multicasting information flow in the avionics all-optical Wavelength Division Multiplexing (WDM) network, the multicast routing problem was investigated more and more widely.The proper configuration of multicast router can not only make full use of the network resource, but also improve the communication efficiency of networks.In this paper, a model of avionics all-optical WDM network is built up and the integer linear programming algorithms with the objective of minimum total cost are proposed separately for network schemes with and without wavelength converter.The algorithms are used in NSFNet network topology for multicast routing configuration.The simulation results show that the algorithm can minimize the cost and ensure the real-time capability.