提出了一种基于介电润湿效应的三液体透镜与传统固定透镜组合的三组元结构变焦光学系统.在一、三组元固定不变的情况下，通过移动中间三液体透镜组改变系统焦距，并通过三液体透镜的自变焦特性，确保系统在变焦的同时保持像面位置不变.采用光焦度高斯括号法求解系统的初始结构参量，利用Zemax光学软件进行系统设计与优化，最后对系统的成像质量进行分析.结果表明: 该系统总长22 mm，可实现2.7~20.3 mm范围内的连续变焦，系统变倍比接近8，在空间频率180 lp/mm处调制传递函数值均大于0.4.

In this paper, a three-group inner-focus zoom system using dielectrowetting-based triple liquid lens and conventional fixed lens is proposed. When the first and the third components are fixed, the focal length of the system is changed by moving the intermediate liquid lens group. The self-zooming property of the liquid lens is realized to maintain the image plane. The initial structural parameters of the system is deduced by the optical power Gauss brackets method. The optical system is designed and optimized by Zemax software, and then the image quality of the system is analyzed. Results show that the system can achieve continuous zoom in the range from 2.7 mm to 20.3 mm; the total length of the system is decreased to 22 mm; the zoom ratio reaches 8 and MTF value is more than 0.4 at 180 lp/mm.