As market competition becomes more intense, the development trend of manufacture is multi-variety, small batch, individuation and minor-cycle more and more obviously. Traditional casting technology with mold manufacturing cannot adapt to the active demand of short delivery date, higher precision, low cost in developing the parts of automobile engine, cover panels pattern etc. Rapid Prototyping technology and NC machining technology begin to be applied to rapid manufacturing of mold. A new rapid manufacturing technology and equipment called Sand-mold Milling was development by China Academy of Machinery Science and Technology, which was successfully used to realize the trial metalwork of automobile -engine parts.