Abstract: During the operations of producing flat yard in the coal mine,locomotive is the main driver of mine car running.Because of the operator or vehicle breakdown,etc.,it will occur that locomotive can not stop in normal which was deviated into inclined shaft and causing car accidents.In this paper,the operations of motor vehicle hung to top intelligently,using machine vision technology to identify the location of locomotive,locomotive was set the alarm location,deceleration position,stop position and corresponding position during the operation.This method is effective to prevent motor vehicle accidents and improve safety of job site.Experiments show that the security is improved since system is running great.