The project is located in the urban area of Zhengzhou, the survey area is complicated and the survey period is short. The project uses UAV aerial photogrammetry, taking advantage of its simple structure and low cost. Complete the surveying and mapping of large-scale topographic maps in complex and small survey areas. The inspection and verification of the project proved the practicability of UAV aerial photogrammetry. It provides technical basis for the development of follow-up project work.