Abstract: With the rapid advancement of 3D digital design,power grid engineering has higher and higher requirements for the digital level of geographic information.This paper systematically expounds the architecture,functional design and characteristics of the integrated platform of three-dimensional geographic information for transmission lines.The platform is based on high-precision DOM,DEM,DLG,laser point cloud data,oblique photography data and field inspection data,relies on attribute data,and combines power grid thematic data,channel data,and basic geological data to build a three-dimensional scene,so as to realize an integrated platform that integration of graphic and attribute,overall analysis,and intelligently provide comprehensive results.In order to promote the steady progress of three-dimensional digital design in power grid engineering.