研究了正八边形翻领成型器的领口交接折线和边界折线的形成，从理论上建立了以直线代替曲线，使翻领曲面转化为平面的以直代曲的设计方法，并推导了正八边形翻领成型器的数学模型，给正八边形翻领成型器的CAD/CAM制造及手工制作提供了理论依据。

Connecting fold line and boundary fold line of regular octagon lapel shaper was studied. The design method of regular octagon lapel shaper was put forward through establishing theoretical model of replacing curves with lines and converting curved surface of lapel to plan. The mathematical model of regular octagon lapel shaper was deduced. The purpose was to provide reference for manufacturing of regular octagon lapel shaper with CAD/CAM or manual manner.