In order to achieve accurate surveying and mapping of curved building plans and sections, 3D laser scanning technology is applied to the surveying and mapping work of curved building plans and sections, achieving optimization of surveying and mapping methods. Apply 3D laser scanning technology to obtain curved building point cloud data, and preprocess the initial point cloud data through steps such as fusion, denoising, and filtering. Extract the contour lines of curved buildings, and through two steps: measuring the structural data of curved buildings and drawing the horizontal and vertical sections of curved buildings, output the surveying results of the horizontal and vertical sections of curved buildings. Through the application effect testing experiment, it is concluded that the measurement error of geometric parameters of curved buildings is significantly reduced through the application of 3D laser scanning technology, and the similarity between the drawn horizontal and vertical profiles and the actual curved building structure is higher. Therefore, 3D laser scanning technology has good application value in the surveying and mapping of horizontal and vertical profiles of curved buildings.