Ballistic missile and anti-ship missile gradually equip Synthetic Aperture Radar (SAR) precise guidance seeker to improve the accurate attack effect, when facing with an increasingly complex electromagnetic environment. Radar as military application, the missile-borne SAR electromagnetic against should not be neglected. Missile-borne SAR seeker mainly faces active and passive jamming from the enemy. This paper summarizes various common types of electromagnetic jamming and briefly analyses its jamming mechanism. Finally, from the point of view of radar seeker system design and combat concept, various feasible anti-jamming means are discussed, which can provide reference for anti-jamming design and application of radar seeker.