液晶的一个重要特性是：液晶的折射率会随所加于液晶上的电压的变化而变化。利用这一特性，我们就有可能制作焦距可变的液晶透镜，变焦液晶透镜对于解决老年人因老花而需佩戴多副眼镜的问题具有重要意义。研制这种变焦透镜的前提，首先要掌握液晶折射率随所加电压变化的规律。本文正是对这一规律进行了研究实验，并得出了实验结果。 An important characteristic of the liquid crystal is that the refractive index of the liquid crystal will vary with the voltage applied to the liquid crystal. With this feature, it is possible to make a liquid crystal lens with variable focal length. Zoom liquid crystal lens is of great importance to solve the problem of elderly people wearing multiple pairs of glasses due to presbyopia. The premise of developing such a zoom lens, we must first master the law of the refractive index of liquid crystal with the applied voltage changes. This article is precisely the law of the research experiments, and the experimental results.