Aiming at the complexity of clutter caused by the uncooperative radar emitter using an uncontrollable third party emitter, a dynamic method of clutter is proposed according to the characteristics of clutter covariance matrix, and a target detection system for uncooperative radar emitter is designed. The results are as follows: after clutter dynamic processing, accurate information of radiation source, target position, velocity and Angle can be extracted by non-cooperative radar radiation source target detection system. The results show that the dynamic clutter can not easily submerge the target with high power, and the target detection system can collect and process the target data, and the errors of position and velocity are less than 1%, which can be used as reference for target tracking and radar signal processing in actual situations.