Abstract: At present,on-line monitoring systems of main ventilator in coal mine generally use the scheme of IPC-based hardware and configuration-based software and the scheme has many disadvantages such as large volume,high cost and unstable system. For above disadvantages,a design scheme of on-line monitoring system of main ventilator in coal mine based on S3C2440 hardware platform and embedded Linux operation system software platform was put forward,and the system’s hardware composition and software design were introduced in details.The system can real-timely monitor parameters of air volume,vibration,voltage and current of main ventilator,and its local data can be remotely browed.