it is a new process of near netshape, precision molding, the process does not need from mold, no parting surface, no sand core, thus casting no flash, burr and draft, and reduce the dimension error due to the core combination. The casting surface roughness can reach Ra3.2 to 12.5 mu m; precision casting size up to CT7 to 9; the allowance for a maximum of 1.5 to 2mm, can greatly reduce the machining cost, compared with traditional sand casting method can reduce machining time from 40% to 50%.