 This paper proposes a block-based modeling method for constructing high-precision digital elevation models, DEMs, of urban plots. The method uses real-sense 3D models, digital ortho-photo maps, DOMs, and dense matching point cloud data to extract the boundaries and elevations of urban plot elements. These elements are then used to generate separate DEMs for each type of element, which are then fused together to create a single DEM of the entire urban plot. This method has been successfully applied to the Jeanshye County urban area, where it achieved an average IMSC value of 0.05 m for all types of elements, meeting the elevation accuracy requirements of the 1,000 large-scale mapping. This article was authored by Minute Lee, Wendai, Sisi Song, and others.