Non-linear parameter measuring method and system strong to noise

Disclosed are a measuring method and a system of a non-linear parameter which can measure a non-linear parameter of a material. A measuring method and a system of a non-linear parameter according to the present invention uses a circuit having an analog band-pass filter and an intermediate frequency amplifier, thereby processing by distinguishing the signals of a fundamental wave outputted by passing a search unit attached on a specimen and a second harmonic wave and minimizing the effects by noise, thereby accurately measuring the non-linear parameters of a material.