Aiming at the problem that there is no unified understanding about the current electromagnetic situational cognition, this paper takes the radar confrontation situation in the electromagnetic situation as the research object, proposes the concept of situational layered cognition, and studies the acquisition and analysis of radar confrontation situation knowledge. To solve the problem of situational knowledge representation, the radar anti-situation knowledge representation model is established, which provides a basis for the subsequent calculation of electromagnetic situational factors and situational representation. This paper also sorts out the relationship between the confrontational situation and the electromagnetic situation, and provides support for the next step of the radar confrontation situation to adapt to the electromagnetic situation.