本文提出适用于计算各类条形介质波导导模传播特性与场分布的微扰方法、变分方法.本文导出的各表达式形式较简单,计算结果较其它近似方法准确,与精确的数值计算符合较好,便于应用. In this paper, perturbation methods and variational methods are proposed, which are suitable for calculating the propagation characteristics and field distribution of waveguide modeguides in various kinds of strips.The expressions derived in this paper are simpler in form, the calculation results are more accurate and accurate than other approximations In line with good, easy to use.