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The hitting point detection for air target plays an important role in the performance evaluation of air defense weapon, which is important to air defense weapon test. Detecting system based on sensing fiber for hitting target of air target is presented in this paper, and the hitting point detection for target is realized by the layout of sensing fiber on the surface of target. The design scheme is checked on physical model, and the results show that the situation of hitting target can be quickly and exactly judged by this detecting system.