Abstract: When the pulse intermittent rectifier works,the load changes rapidly,the input frequency varies substantially and the input voltage/current distorts severely.The SCR（Silicon Controlled Rectifier） gating strategy for this application is rarely addressed in published works.This paper focuses on megawatt intermittent rectifiers with the heavy capacitive load,and proposes and realizes a novel SCR gating strategy.The proposed gating strategy will adjust real-time gating pulses according to the changes of anode-kathode voltages of SCR and overcomes the existing shortcomings of present SCR gating strategies very well.The strategy is compact,credible and practical.To perfect the system structure,a real-time gating diagnosis method is also integrated with the strategy.In real operation,the strategy works perfectly and performs well even under sudden load variation;the gating diagnosis method coincides with the theoretical one,and it can provide credible information for system control.