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The usual interfere methods such as laser, smoke screen, infrared stealth and bait were studied by the numbers, and the detecting ability model of the space based early-warning system with no interference was established at first. Then, these interfere methods' effect models were established as well as the modified detecting ability model of the space based early-warning system considering these interference. And then, the interfere effect of those methods on the detecting ability of space based early-warning system was studied through simulating examples, with the emphasis on the effect on the first warning height, the detecting distance, the SNR and the detecting rate. As it is shown by the simulating result, all of these interfere methods had an useful kind of effect, but it is too expensive and hard to achieve the perfect interfere effect if only one of them is used. So, the economic and feasible way is to use those interfere methods together, and it has provided an perfect interfere effect on the detecting ability of the space based early-warning system in the simulating example. The studied result here could be helpful and useful during the decision-making course of aerospace defense.