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A finite element simulation model of the high-speed electro-pneumatic ejector valve actuator was built to analyze its steady state and transient performances. Optimal design was implemented by turning the fringe part and boring the center part of the armature base on steady state finite element analysis. Comparing with the original actuator, the optimized actuator has an almost 71% reducing in the armature weight whilst without significant steady state solenoid force loss in the actuator and without significant increase in structure dimensions that it gets a considerable improvement in armature acceleration, so the response times decrease by typically 8% under different work conditions. Finally, prototype electro-pneumatic ejector valves were fabricated according to the optimized actuator model, and a test facility was also built up to obtain the valve’s dynamics. The agreement between the simulation results and the experimental data proves the effectiveness of the simulation model.