According to the firing orders of multiple launch rocket system will affect its dynamic performance, to explore the optimization problem of the firing sequence of rockets. The launch dynamics of certain type multiple launch rocket system was integrated in multidisciplinary design optimization software Isight, used multi-island genetic algorithm (MIGA) in Isight to optimize the firing orders of multiple launch rocket system based on the rocket initial disturbance among the smallest deviation. The calculation results verify the feasibility of the optimization of the firing sequence. The results show that the multi island genetic algorithm is a good method to solve the non convex and highly nonlinear problem. This method can provide reference and basis for the optimization of the same type of rocket weapon firing order.