Based on the analysis on breaking process of field discharge switch, the paper presents approaches to improve its operation performance ( Ioad ) by using high-energy ZnO voltage dependent resistor, LC oscillating circuit and PTC element. 通过对灭磁开关分断过程的分析,提出了利用高能ZnO压敏电阻、LC振荡电路、PTC元件来提高灭磁开关电寿命的技术途径。