In view of the fact that new EMUs trains, high power locomotives and metro vehicles in our country all adopt ac traction motor as power, developing modern AC traction motor overhauling line, this paper elaborated the technical flow of AC traction motor maintenance and the principles of workstation design, and took AC traction motor overhauling line of EMUs for example to introduce the line’s convey-device, major equipment and the structure and function of its information management system, as well as analyzed the society and economic benefits.