在单轴晶体光轴任意取向的情形下 ,应用惠更斯原理导出了非寻常光折射方向的普遍计算公式 ,并给出了确定非寻常光线折射面和折射角的具体解。结合几种熟知的特殊情形进行了简要讨论 ,揭示了文中所得到的折射规律较之斯涅尔定律更具有普遍性 ,从而为光学系统中各类单轴晶体光学元件的应用提供了一个理论依据 In the case of arbitrary orientation of uniaxial crystal axis, the general formula for the extraordinary direction of light refraction is deduced by using the Huygens principle and a concrete solution for determining the extraordinary refractive index and refraction angle is given. Several well-known special cases are briefly discussed, revealing that the refraction law obtained in this paper is more general than Snell’s law, and thus provides a theoretical basis for the application of various types of uniaxial crystal optical elements in optical systems