分析了光折变晶体的电光系数对二波耦合特性的影响。二波耦合能量转移方向不仅依赖于晶体中光生载流子的电荷符号以及入射光与晶体ｃ轴的相对取向，而且依赖于晶体电光系数各分量的相对大小；这种特性特别明显地表现在相向二波耦合作用中。对不同掺杂浓度（掺铈或掺铑）的０°切割和４５°切割的体块及薄片的ＢａＴｉＯ３晶体进行了实验观察，结果与理论符合得很好。 The effect of electro-optic coefficient of photorefractive crystal on the coupling characteristics of two waves was analyzed. The energy transfer direction of the two-wave coupling depends not only on the charge sign of the photo-generated carriers in the crystal and the relative orientation of the incident light and the c-axis of the crystal but also on the relative sizes of the components of the electro-optic coefficient of the crystal; Wave coupling. The BaTiO3 crystals with different doping concentrations (cerium-doped or rhodium-doped) and 0 ° and 45 ° cutting were observed. The results are in good agreement with the theory.