Passive detection of moving target is an important part of intelligent surveillance.Satellite has the potential to play a key role in many applications of space-air-ground integrated networks (SAGIN).In this paper,we propose a novel intelligent passive detection method for aerial target based on reservoir computing networks.Specifically,delayed feedback networks are utilized to refine the direct signals from the satellite in the reference channels.In addition,the satellite direct wave interference in the monitoring channels adopts adaptive interference suppression using the minimum mean square error filter.Furthermore,we employ de-coupling echo state networks to predict the clutter in-terference in the monitoring channels and construct the detection statistics accordingly.Finally,a multi-layer perceptron is adopted to detect the echo signal after interference suppression.Extensive simulations is conducted to evaluate the performance of our pro-posed method.Results show that the detection proba-bility is almost 100％ when the signal-to-interference ratio of echo signal is-36dB,which demonstrates that our proposed method achieves efficient passive detec-tion for aerial targets in typical SAGIN scenarios.