选区激光烧结(SLS)是重要的3D 技术之一。烧结高分子材料成型过程中，材料的不均匀收缩导致制件翘曲变形及尺寸减小。而在烧结过程中工艺参数起着主要影响作用。激光烧结聚丙烯(PP)复合粉末成型过程中，采用各工艺参数不同水平组合烧结成型制件；用灰色关联分析法(GRA)研究工艺参数对成型精度的影响。结果表明，对于翘曲量及尺寸精度最重要的影响因子为扫描速度。综合工艺参数对翘曲量和尺寸误差的影响，得到激光烧结PP 制件的优化工艺参数：扫描速度为1.9 m/s，激光功率为16.5 W，铺粉厚度为0.15 mm，扫描间距为0.12 mm。

The selective laser sintering (SLS) is one of the important 3D printing technologies. In the sintering process of the polymer material the uneven shrinkage will cause warp and decrease the size of parts. The SLS processing parameters playing the major influence are discussed. Based on the theory of the gray relational analysis (GRA) in the SLS experiment with the polypropylene (PP) composite powder, the results show that the most important parameter is the scan speed. Considering the comprehensive effects of the warp and molding accuracy, the optimized fabrication parameters of the forming process are got as follows: the scanning speed is 1.9 m/s, the laser power is 16.5 W, the scanning width is 0.12 mm and the single layer of powder is 0.15 mm.