在正交网格体系中建立物理模型共形描述的基础上，针对采用扩展元胞技术的共形时域有限差分(ECTCFDTD)方法模拟计算波导器件遇到的开放端口截断问题，给出了积分形式的共形卷积完全匹配层方法，算法具有与ECTCFDTD相同的数值稳定性。设置不同的完全匹配层的控制参数，对波导中有消逝波存在的情况进行长时间模拟计算，分析共形卷积完全匹配层对消逝波的长效截断能力，分析卷积完全匹配层的截断误差。计算结果显示:积分形式的共形卷积完全匹配层可有效截断波导器件的开放端口。

Based on conformal construction of the physical model in the threedimensional orthogonal mesh system, an integralbased conformal convolutional perfectly matched layer(CPML) algorithm is given for solving the open port truncation problem when the enlarged cell technique combining with conformal finitedifference timedomain (ECTCFDTD) method is used to simulate the wave propagation inside a hollow waveguide, and the algorithm has the same numerical stability as the ECTCFDTD method. For the evanescent wave longtime propagation problems in a waveguide, several numerical simulations are done to analyse the reflection error by conducting sweeps of constitutive parameters of the integralbased conformal CPML. Numerical results show that the integralbased conformal CPML can be used for efficiently truncating the open port of the waveguide.