The paper analyzed the dynamic process of series thyristor in detail and designed the snubber circuit and bod protecting circuit against over - voltage for thyristor . a pspice simulation mode of series thyristor based on dynamic process is set up and the simulation verifies the validity of the snubber circuit 论文详细分析了多个晶闸管元件串联工作的动态过程,设计了晶闸管的吸收电路和过压保护电路,建立了反映多个晶闸管元件串联工作动态过程的pspice仿真模型,并通过仿真分析验证了所设计电路的有效性。