In order to provide a good man-machine interface for electric power control operation running, to achieve unattended or less intervention graphics maintenance work, the concept of automatic mapping is proposed. This paper mainly introduces the methods and effect of automatic mapping. Firstly, the overall framework of the system is given, and then the basic process of three automatic mapping models, which are model extraction, node layout and graph routing are introduced. At the same time, this paper makes a description of various types of automatic mapping, and taking the single line diagram and the system diagram as an example, the paper describes the application of the tree level layout, the boundary layer layout algorithm and the channel routing algorithm. Finally, the application effect of the grid automatic mapping will be showed in the paper.