In order to ensure the normal operation of the single crystal furnace and reliable power supply, reducing high harmonic pollution on the grid, improve equipment operating conditions, it is necessary to take measures to filter harmonic currents, taking into account the fundamental reactive power compensation, according pullers operating characteristics, requiring harmonic control and reactive power compensation device must have rapid adjustment function, I am using the filter circuit switching thyristor dynamic way (TSF) the characteristic harmonic crystal furnace equipment produced separately filtered, absorbed harmonic wave current, improving power load characteristics, while fundamental reactive power compensation to improve the power factor, energy-saving benefits to the user.