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In order to solve the problem of remote control of PowerPoint slides and microphone whistling in the process of classroom teaching, this paper designs a teaching control system, which adopts the wireless control structure based on Bluetooth transmission to design the hardware circuit and software flow of inertial sensor and receiving device. This paper focuses on the definition and feature extraction of gesture motion based on inertial sensor, and discusses the realization method of microphone squealing elimination. The experimental test data show that the success rate of gesture recognition is more than 92%, and the error rate is less than 4%, the system can control the PowerPoint Slide to turn up or down, control the volume of wireless microphone, and can real-time alleviate the interference caused by microphone roar, and achieve the design effect.