Based on Taguchi experimental design method, the L25(56) orthogonal matrix has been adopted for an experimental design, a 3-D numerical simulation of the injection molding process of short-glass fiber reinforced PA66 composites has been carried out, and a research on the influence of different process parameters of the injection molding and interaction coefficients of glass fiber on the orientation tensor of injection molded fibers has been conducted by making use of Moldflow software. The experimental result shows that the fiber interaction coefficient (Ci) has a significant effect on fiber orientation, with a contribution rate as high as 99.999 994 57%. Within the range of experimental parameters, the average fiber orientation tensor decreases monotonically as the fiber interaction coefficient (Ci) increases;while the fiber orientation tensor is under little influence of five injection molding processing parameters, namely, the mold temperature, the melt temperature, the injection time, the packing pressure and packing pressure time. Meanwhile, with fiber interaction coefficients the independent design variables, and by making use of Newton linear difference, a 4 order regression equation of the fiber orientation tensor of injection molded parts has thus been established. This equation can provide references for the prediction of the fiber orientation at the principal stress direction of injection-molded parts and the determination and evaluation of the nature of the intensity enhancement effect.%基于Taguchi试验设计方法，采用L25(56)正交矩阵进行试验设计，并利用Moldflow对短玻纤增强PA66复合材料的注塑成型过程进行了3D数值模拟，研究注塑成型不同工艺参数和玻纤相互作用系数对注塑件纤维取向张量的影响。结果表明：对于短玻纤增强PA66复合材料，纤维相互作用系数对注塑件纤维取向影响最显著，其贡献率达99.99999457%；在实验参数范围内，随着纤维相互作用系数的提高，注塑件的纤维取向张量单调下降；模具温度、熔体温度、注塑时间、保压压力及保压时间5个注塑工艺参数对纤维取向张量影响甚微。同时，以纤维相互作用系数作为独立设计变量，利用Newton线性差值，建立了注塑件纤维取向张量的4阶回归方程，该方程可用于预测注塑件主应力方向的纤维取向，定性评估其强度增强效果。
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