Hyperpolarizability of chiral molecule was derived from the classical model of the coupled two-vibrator.In a given condi本文从手性分子的耦合双振子经典模型出发，推导出手性分子的超极化率.在特定情况下，给出了三阶非线性极化率的表达式.基于该模型讨论了手性介质分子各向同性分布的宏观非线性极化率.