随着科学技术的发展，LED在很多领域中被应用得越来越广泛，如在信号灯中的应用，因此就需要对LED发出的光线进行二次光学设计。文中介绍了一种LED信号灯的二次光学设计思路和方法，通过对光通量的估算，设计出合理的LED 分布、光学面罩和菲涅耳透镜。

With the development of LED technology，LEDs have involved more and more application fields，e．g．singal lamp．Therefore，it demands seconda ry optics deisgn methods suitable for LEDs．This paper introduced an ideas about secondary optics deisgn methods of singal lamp‘S．Through the flux estimates，the design of a reasonable distribution of LED，optical masks and Fresnel lens．