In recent years, with advances in technology, the Unmanned Aircraft System and Unmanned Aerial Vehicle technology and rapid development, significantly improved flight stability of Unmanned Aerical Vehicle than ever before, the use of Unmanned Aerial Vehicle aerial photogrammetry, can quickly obtain disaster scene of the accident first time images of disaster information and rapid production of the affected areas Ortho-Photo and emergency relief funding for subsequent processing and application of reference. Orthophoto map data is the dot height and tilt of an image displacement aerial image on removal, which provides the correct geometry and radiation information as basemap of geographic information, or nested numerical simulation of three-dimensional terrain and elevation model as for related research purposes. This study was performed orthophoto mosaic Chihpen Forest Recreation Area through the three image stitching software, compare the quality of the outcome of the orthophoto and root mean square error, a reference for subsequent research.