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Virtual two-dimensional (2D) lidar is part of the expansion of the lidar applications. 2D laser radar simulation process of detecting obstacles is based on point cloud features of 3D scene. The analytical solutions are obtained by integral equations based on light conduction characteristics of lidar map generated in a multi-barrier scene,then virtual two-dimensional (2D) lidar is achieved with the joint program of Visual C # and AutoCAD . Experimental results show that the virtual lidar can extract the location and distance information of objects from the 3D scene accurately comparing with real 2D lidar.