A large number of high and inferior harmonics have been produced by the devices of rectifiers, frequency converters and other equipment widely used from all walks of life with the improvement of industrial automation standard, high-inferior harmonics the electricity power system, which distorts the waveform of voltage and current of the electricity system and deteriorates the power quality. ACSOON low voltage harmonic resistance high-pass filter device is the best way of controlling harmonics in power supply system, this device mainly resolve harmonics and takes reactive power compensation into account. It can be widely used in railway,petrochemical, light industry, machinery manufacturing, municipal and other industries where harmonic pollution exists. For instance, self-care of high and inferior harmonics in railway network system.