IR optical detector system can work at strong radiation and electromagnetic interference caused by the operation of high power microwave(HPM) system. The strong electromagnetic pulse generated by HPM will enter the inner circuit system through the front-end optical lens of the detector with the back-door coupling, resulting in the phenomenon of instant black screen, image jitter, electronic device destruction and so on. The optical window was developed by using embedding metal lines into optical materials. These metal lines were made to be a net and to be implanted in the middle of optical glass. The performance of electrical shielding was up to 65 dB in 2.4 GHz±100 MHz frequency band. It can meet the requirement of the optical window transmittance of the detection target. The application shows that the image of the optical detection system loaded with the electromagnetic shielding optical window is stable and undisturbed when the HPM is working.