Abstract: Oblique photography is a new technology that developed recent years in the area of surveying and mapping. It can demonstrate the 3D environment more realistic than ortho-photo. The results of the image can be used in measuring height, length, acreage, volume, angle and gradient, etc. In the meanwhile, it can cut the cost of 3D modeling by bulk texture mapping. This research uses oblique photography in the application of UHV transmission line optimization, provides intuitive and accurate 3D data for the optimizing and ranking of UHV transmission lines, as well as the decision-making basis for the electric power line design.