Building sand table model, sand table model of real estate, urban planning model, house model, house model, villa model, SKP model, 3d max models, industrial models, military model making, marine modeling, aircraft modeling, model boats, mechanical models, industrial models model design and production. (1) design molding method subtraction: for simple small product design model, in fact, take omitted, cutting, etc., design and processing on one or several basic geometry to obtain the shape of the new geometry. Such designs are available and easy to shape clay, sludge, gypsum, rigid foam as the material to hand-cut method, sculpture, filing, planing, scraping molding. ? (2) Addition design molding method: This model produced a wide range of products targeted to the medium, such as washing machines, refrigerators, air conditioners, motors, machine tools. Addition is a building block approach to forming the basic shape of the surface geometry of the block to take a pile of flattened shape to become the new entity. Use of polyethylene resin plastic profiles can also be used wood, tilling the soil, sludge, gypsum, rigid foam to produce. ? (3) mixed design molding method: is an integrated design molding method, add, subtract, or a combination of various molding, larger models complement finished product. Such as large-scale machine tools, automobiles, ships, missiles, aircraft, satellites and so on. General should use wood, plastic molding, metal alloy as the main material.