引入一种计算光波导传播特性的新方法传递函数方法。给出了公式推导，计算了扩散各向同性及扩散各向异性平面光波导的传播特性，并与其它方法所得结果进行了比较。结果表明用传递函数方法处理折射率渐变分布的光波导问题，计算相对简单，可以得到精确的数值结果。 A new transfer function method is introduced to calculate the propagation characteristics of optical waveguides. The formula derivation is given, and the propagation characteristics of diffusion isotropic and diffusive anisotropic planar optical waveguides are calculated and compared with those obtained by other methods. The results show that using the transfer function method to deal with the optical waveguide with graded refractive index distribution, the calculation is relatively simple and accurate numerical results can be obtained.