Rapid prototyping technology for producing quickly and precisely metal molds is explored, and the Selective Laser Sintering (SLS) is used to produce a high precision ceramic mold for precision manufacturing. On the basis of orthogonal test and range analysis , the effects of process parameters of SLS, including laser power, scan speed, scan spacing and layer thickness, on the dimensional accuracy of machining work-pieces are discussed and then the optimum parameters are determined. The founder technique is used to replace the traditional removal of organic binders and to improve the precision manufacturing for the ceramic mold. The results show that the shrinkage of the work-piece size is 2% under the conditions of the laser power of 25 W, scan speed of 2.0 m/s with a scan spacing of 0.19 mm and the layer thickness of 0.25 mm. As the ceramic molding founder technique strips easily and the ceramics after stripping has a smooth surface, its tensile strength has been 0.361 MPa in 200℃ roast. These data indicate that the combination of ceramic molding and precision casting has the potential to produce rapid and precise castings.