Abstract: It is defined as laser scanner virtual volume-measuring system in the paper that to collect the spatial point clouds of a moving surface mining transport vehicles and to achieve accurate measurements of the exploitation of shipments with the application of laser scanning. There are time error, GNSS error and spatial point cloud measurement error in the system while in the process of acquisition and integration of spatial data, the existing measurement error model cannot accurately express the error propagation of the system. In the paper, an error propagation model is designed for the system, and it applies to the measuring system that has structural similarity to the virtual volume-measuring system. The paper discusses the factors affecting the measurement accuracy with examples, draw the error characteristics of different surface construct method, which has an instructional significance to the construction and application of similar systems.