For obtaining the low detailed surface graphic information, a point cloud informational automatic acquisition system was designed, which is based on line-laser scanning and precision programmable translational. The system realized that a low thickness objects ,which is within the scope of A3 paper size, is scanned automatically by dividing into several parts，and that the point cloud of each part was jointed together without gap, generating a full width point cloud model of the objects. For facilitating observation and analyzing and realizeing the 3-d printing, point cloud data is dealt by selecting area of interest, point cloud height histogram statistics, drawing contour map, triangular mesh and obtaining the object’s 3-d model and calculating the model’s surface area. The designed system achieved the point cloud collecting of the plane accuracy in the area of ± 0.01 mm and the high accuracy in the area of ± 0.002 mm.