In order to improve the response characteristics of the highspeed rail system consists of the injection valves of diesel engine high pressure,using ansoft finite element calculation software of electromagnetic field,the structure and static and dynamic parameters of the permanent magnet type injection valve were optimized.The correctness of the simulation results was verified by comparing with the main parameters of the electromagnetic fuel injection valve and permanent magnet type injection valve.The optimization results show that the structure of permanent magnet type injection valve and the dynamic characteristics are better than the electromagnetic fuel injection valve.