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采用截面异形化纤维是生产仿真丝织物的途径之一，涤纶异形丝是一种生产仿真丝织物的原料。文章根据多组分复合熔融纺丝工艺，设计了涤纶三叶形纤维的纺丝组件；通过POLYFLOW软件模拟，优化纺丝工艺参数，确定纤维的截面形状。实验中两个组分分别添加不同颜色色母粒，另一组分则不添加，三组分复合熔纺开发出一种三色三叶纤维。三个叶片分别呈现不同颜色，增加了纤维的光泽度和炫彩效果，可用于制作晚礼服和需要闪光点缀的纺织品及仿真丝织物。且相对常规涤纶纤维，三色三叶纤维有更优异的透气性和透湿性。“,”Making the cross section of fiber to be difform is one of the methods to produce silk-like fabric. Polyester profiled fiber is a kind of raw materials for producing silk-like fabric. According to the multicomponent composite melt-spinning technology, the spinning pack for trilobal polyester fiber was designed. This article optimized spinning process parameters and determined the cross section of fiber by POLYFLOW software simulation. In the experiments, different color masterbatchs were added to the two components respectively, and the another component added nothing. In this way, a trilobal fiber with three colors was developed by three-component composite melt-spinning. Because three blades prevented different colors, the glossiness and colorful effect of the fiber increased. Thus, the fiber can be used for making evening dress and silk-like fabric embellished with glitter. Compared with conventional polyester fiber, trilobal fiber has more excellent air permeability and moisture permeability.