Abstract: The micro-UAV (Unmanned Aerial Vehicle) aerial survey technology has been widely used in geospatial information data acquisition owing to its advantages of low cost, flexibility and simple operation. In order to study whether it can be applied to large-scale topographic mapping and its measurement accuracy can meet the specification requirements, micro-UAV aerial survey technology was applied in 29 survey areas of a certain pipeline mapping in reference to the traditional aerial photogrammetry method. Then, the orthophoto map was plotted and the ground elevation model was established by optimizing the micro-UAV flight design, laying out the ground image control points reasonably and carrying out aerotriangulation encryption comprehensively. Finally, the results measured by micro-UAV were verified by means of field measurement. It is shown that the plane accuracy of the micro-UAV aerial survey technology can meet the requirement of the specification and this technology is applicable to the plane measurement of large-scale topographic maps.