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The energy conversion efficiency of a multistage synchronous induction coilgun (MSSICG) has become one of the key factors that restricts its industrialization. To improve the launch efficiency of medium- and high-velocity MSSICG, we propose an optimization design scheme combining orthogonal experimental design (OED) and self-consistent design method in this paper. The OED is introduced to reduce the number of iterations and improve the identification accuracy and efficiency. A self-consistent design model is established to overcome a defect that the parameters that need to be optimized will multiply as the number of coil stages increases. The influence of six factors (radial thickness of armature, axial length of armature, axial length of coil, capacitance, wire diameter, and slip speed) on the launch efficiency are then evaluated by range analysis. This work presents a valuable reference for optimizing medium- and high-velocity MSSICG.