Aim\ To real time monitor the bow net troubles of electric locomotive. Methods\ By means of lashing accelerometer and position sensor to realize the real time monitoring. Results\ A dynamic monitor system is designed which has a self inspection function in the meantime. When bow net troubles take place

they can be warned about in time. Conclusion\ Motorman can know in time the runing of electric locomotive avoiding to unnecessary failure. It is featured as easy in using and flexible in operation.