This invention discloses an audio process circuit structure and process method applying to a video/audio apparatus that at least comprises an audio signal detection unit, an OR gate logic circuit unit, an AND gate logic circuit unit and an audio amplifier process unit. The audio signal detection unit also comprises a coupling capacitor, a signal amplifier circuit, a DC level shift circuit, a charge circuit and a switch circuit. This audio signal detection unit transfers different amplitude and frequency of the signal to be a high or low DC logic level signal. The high DC logic level signal is an audio signal and the low DC logic level signal is a noise. When the noise is inputted to the audio signal detection unit and a mute control signal is outputted by the audio signal detection unit to disable the audio amplifier process unit so as to prohibit the noise to output.