The Topographical Survey (for portals and tunnel alignment) of Baglung-Beu-Narethati Road Tunnel Project has been completed using Drone Technology with necessary ground control stations establihsed using DGPS. The drone survey proven to be one of the cost effect method with required accuracy especially when there is no vegetation. The drone survey generate very high-resolution Digital Surface Model (DSM) and high accuracy Digital Elevation Model (DEM) required as per requirement of the project.