In view of power frequency operation of high voltage motor, the disadvantages of the adjustment method of liquid-coupling velocity were analyzed in energy consumption and operation mode. Based on energy-saving principle of high voltage frequency converter, the reformation scheme of coal charging and coke pushing dust removing fans using high voltage frequency variable speed regulation method was presented, the PLC remote control mode was designed, and the structure and main functions of the system are introduced. The frequency conversion scheme has been put into operation in coal charging and coke pushing dust removing fans of Tangshan Jiahua Coal Chemical Corporation Ltd..Through comparing and analyzing the economic benefits before and after transformation, it is concluded that the adoption of high voltage inverter have obvious effect on energy saving.