In order to prevent the scaling and salt of boiler, steam turbine, slow the corrosion of metal parts in the system, ensure the safe and economic operation of the system, extend the maintenance cycle and service life of thermal equipment, we must monitor the quality of feed water, condensate water, furnace water, steam, measuring the water quality conductivity, PH value dissolved oxygen, sodium ion, silica water, phosphate root, turbidity, and other water quality parameters control in a reasonable range through chemical dosing device.