On the basis of terrain data and 3D models, according to the application requirements of State Grid power line inspection, the State Grid power line inspection software is designed and implemented in the open source engine(Object-oriented Graphics Rendering Engine(OGRE)). The software develops and integrates 3D scene display, roaming browsing, point cloud layer selecting, color of power line changing, distant checking, towers positioning, 3D ranging and so on. It can meet the requirements of industry applications and lays a foundation for further study on its engineering.