Abstract: Anti-radiation UAV regarded as an anti-radiation weapon clustering out in batches and sorties will be a serious threat to air defense radar. In order to study the problem of attack helicopter charging with Anti-radiation UAV threat in a quantitative way, based on fundamental process of guiding attack helicopter to intercept, airspace constraint model, guiding and intercept model and intercept mission distribution model are built, and average intercept probability model for evaluating intercept effectiveness are given. Finally, models are evaluated with an example. The result shows that attack helicopter used for intercepting anti-radiation UAV is effective.