First of all,the deficiencies of noise interference and coherent interference based on drop edge trigger in radar radio frequency(RF) cover are analyzed, the research is focused on the interference response time and frequency agility signal adaptability. It is pointed out that the response time of coherent interference based on drop edge trigger is long, which is easy to be recognized by the operator and impossible to adapt to frequency agility signal. Therefore, the jamming method based on pulse cluster identification is proposed. The advantage of this method in anti-radar RF cover is analyzed, and its effectiveness is verified.