For the electromagnetic system of control electrical equipments' energy saving issues, a thyristor based electromagnetic system energy saving program was proposed. The input terminal of thyristor control unit is connected to AC power. Capacitor charging and discharging time is controlled by adjusting the variable resistor. Different charging and discharging time of the capacitor can change the phase-shifting angle of the thyristor trigger pulses thereby changing the conduction angle of the thyristor. By adjusting the variable resistor, different pull-in voltage and hold voltage are obtained which can be applied to different electromagnetic systems, and enhances the versatility greatly.