With the continuous transformation and upgrading of my country's "digital city" to "smart city", GIS applications based on two-dimensional vector data have been difficult to meet the needs of urban intelligent management. The important construction task of national basic surveying and mapping during the "14th Five-Year Plan" period, the urban 3D platform can provide the city's 3D base for the comprehensive management of natural resources and smart city management, and provide basic data and information for urban planning, management, fire protection, emergency response, ecological environment monitoring, etc. management platform. Therefore, how to quickly and accurately obtain 3D data in geographic space has become an important support for the 3D construction of real China. UAV oblique photogrammetry has become an important way to obtain oblique photography data due to its efficient and flexible data acquisition capabilities.