The conference system consisting of the intelligent mixer is easy to operate, with high-fidelity audio amplification circuits for a mellow and clear tone. At the same time it can maximize the elimination or attenuation of feedback in these venues while ensuring that the sound quality is not changed. RS-232 port can be used to connect with the central control or industrial control equipment, which can be used to turn on or off the control of each microphone to realize remote control of the microphone switch, the rear panel is equipped with an external control output terminal, which can be connected to the video tracking controller MV-32, to form a video conferencing system.