In view of the complex manufacturing process of topographic sand table, large manual dependence and low precision, a method of making topographic sand table by patternless cutting with high precision was proposed by combining with the complicated casting patternless composite manufacturing technology and equipment independently developed by the general institute of mechanical science research. The results show that the formless composite forming technology and equipment for complex castings can make the topographic sand table quickly and accurately through the rapid production and scanning analysis of the topographic sand table in a certain area. The processing method is applicable to the processing requirements of sand table of different materials.