Different panels of microwave source case have different numbers and sizes of rectangular holes and cooling vents. Electromagnetic pulse can couple into microwave source case by penetrating through the holes and vents, and then cause interference to the inner circuits and equipment. The adaptive mesh refine technology is used to achieve the rapid modeling of the 1 kW microwave source case. The parallel Finite-Difference Time-Domain ( FDTD) algorithm is used to simulate the coupling problems between Gaussian pulse with different polarization direction under normal incidence and the microwave source. The results show that, the numerical calculation results agree well with that simulated by electromagnetic software, and the polarization direction of electromagnetic pulse doesn’t influence the electric field strength coupling into the microwave source, and the resonant characteristics of the center of microwave source is obvious.%微波源机箱的不同面板上开有不同数量和大小的矩形孔缝和散热通风孔，电磁脉冲可以通过机箱上的孔缝耦合进入微波源内部，对内部电路和设备造成干扰。通过自动网格剖分技术实现了1 kW微波源的快速建模，采用并行时域有限差分( FDTD)算法模拟了不同极化方向下高斯脉冲正入射1 kW微波源机箱的耦合问题，分析了微波源机箱的电磁脉冲耦合规律。研究结果表明，数值计算结果与电磁软件仿真结果吻合得比较好，电磁脉冲的极化方向对耦合进入微波源箱体内的电场强度影响不大，微波源机箱中心点的谐振特性明显。
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