Investment Casting was fit to make precision product, which was difficult to be machined and has complex shape with high level of technology difficulty. The products could be by many kinds of material such as carbon steel, alloy steel and stainless steel, Especially, the stainless steel polished parts are popular used on yachts, sports hardware, and construction hardware. The parts we made, the weight is from 8 grams to 30 kilograms, and the dimensional tolerance reach the standard ISO8062 Ct5-7 grade, the surface roughness range form 3.2-12.5/um.