从电光效应出发，对LiNbO3电光偏转器的基本品质因子进行研究，导出了偏转器的设计公式，用有限差分法计算了四柱面电极电光偏转器的电场分布，对不同结构参数，给出了梯度线性度和结构因子。

The fundamental figure of merit of LiNbO3 deflector was studied based on the electro optic effect. Designning formula was derived. The electrical potential distribution over the deflector with four cylindrical electrodes was calculated by the mathod of finite difference. Refractive index gradient linearity and structure fractor were obtained for deffrent struture parameters.