Standardized components, can assemble to over one decade prefab of different sizes and purposes. The purpose of prefab--typical engineering is widely used in office, headquarters, drawing room, dormitory, exhibition hall, warehouse, shop, workshop, traveling facility, entertainment place, extra floor to the cockloft and temporary used house. Sales and tenancy are simultaneously developed, the expenses is divided into prefab itself, installation, disassembly, transportation and optionable decoration, all the above is individually valuated.