The application of web geographic information system(Web GIS) in power transmission and distribution projects is introduced in the paper, taking the management information system for power transmission and distribution as an example. By using spacial basic data and related design products, the management information system visualizedly provides a spacially collaborative management platform for the owners, developers, construction organization and supervision units. By showing the spacial position, work process and other real-time data visually, accurately and entirely, the system provides an advanced and assistant technical support for project construction, and presents electronic documents with entire spacial position information for production and operation department. The application of the system obtains good results in the field management of power transmission and distribution projects.