In order to study the dynamic and static characteristics of the pilot stage water-based high speed on-off valve of a water-〖JP〗based proportional valve,a water-based high speed on-off valve electromagnet was selected as the research object.Its structure and working principle were explained.An electromagnetic simulation model in was built by Ansoft Maxwell software.By studying the steady-state electromagnetic force of planar and conical magnetic poles,it was found that the water-based high speed on-off valve electromagnet was more suitable for planar magnetic poles,and the relationship between the steady-state electromagnetic force and half cone angle θ were obtained.Then,a magnetic isolation ring was added to optimize the magnetic flux of the loop,and the influence of the structural parameters of the magnetic isolation ring on the electromagnetic force was analyzed.Based on simulation results and production processes,the optimal parameters of the magnetic isolation ring were determined.Finally,a composite PWM control strategy was proposed to improve the dynamic characteristics of the electromagnet in response to the problems of long hysteresis time and low response frequency.According to simulation and experimental results,the hysteresis closing time of the electromagnet is shortened by 15.8 ms,and the response frequency is increased from 29 Hz to 40 Hz.