针对现有屏蔽光学视窗透过率低、表面反射率高的缺点，提出一种高效屏蔽光学视窗的设计方法。即将ITO材料作为光学介质的一种，采用匹配的多层膜设计原理，将多层ITO 匹配到减反膜系中。通过用Madab语言对膜系进行仿真、优化，实现了反射率低于O．3％，透过率大于99％的光学性能，并通过特殊的结构把多层ITO连接在一起，实现高效电磁屏蔽性能。

For most EMC techniques to achieve high RFI／EMI attenuation，the visible transm ission is relatively low，and the reflection is unwanted high．This paper reference a new method for EM C optical windows design，based on immersing the multi ITO layers in a multi-layer AR coating designed to match the refractive index of the ITO，can reduce surface reflections to~0．3％ average and the transmission beyond~99％ ．It is simulated by Matlab language．Rs values <5 ／sq．can be achieved through getting multi ITO layers together．It will provide attenuations exceeding 70 dB．