Abstract: With raw materials,such as wood powder,hot melt adhesive and polypropylene,the wood-plastic composite materials are made by selective laser sintering(SLS) technology,and molded with the HRPS-Ⅲ laser rapid prototyping machine.The orthogonal optimization method is used for experimental design.The wood-plastic composite materials are sintered with different process parameters(laser power,laser beam scanning speed,scan spacing and preheating temperature).A group of process parameters,which guarantee not only the quality and efficiency of the sinter processing,but also reasonable match of optimization forming,are obtained by using variance analysis method.The results show that the sintered density increases as the scanning speed and the scan spacing decreases,and laser power becomes larger and preheating temperature grows.