Abstract: According to typical ventilators models, performance features in coal mines, the main ventilators monitoring and fault early-warning system had been developed based on analyzing coal mine ventilation methods and ventilators arrangement. This system mainly collected various parameters of ventilators, such as voltage, current, motor temperature, vibration situation, power factor, and it carried out real-time monitoring for air volume, air pressure and humidity of ventilators outlet. Through the signal transmission system, the above-mentioned parameters were sent to the computer system. Finally, by signal analysis and processing, it could determine the running state and motor characteristics of ventilators, and provided early-warning for all kinds of faults for ventilators and motors.