Direct slicing from CAD models to generate sectional contours of the part to be sintered for Selective Laser Sintering (SLS) may overcome inherent disadvantages of using a Stereo Lithography (STL) format. In this paper, a direct slicing procedure is proposed for Selective Laser Sintering based on material performance and process parameters. Slicing thickness depends on the 3D geometric model, material performance and process parameters. The relationship among material performance, process parameters and the largest slicing thickness is established using analysis of a sintering temperature field. A dynamic linked library is developed to realize direct slicing from a CAD model. Direct slicing from CAD models to generate sectional contours of the part to be sintered for Selective Laser Sintering (SLS) may Allowed not predominantly of using a Stereo Lithography (STL) format. In this paper, a direct slicing procedure is proposed for Selective Laser Sintering based on material performance and process parameters. S relationship between material performance, process parameters and the largest slicing thickness is established using analysis of a sintering temperature field. A dynamic linked library is developed to realize direct slicing from a CAD model