ECM aiming at fire control radar is an effective method for improving ship-to-ship missile penetration capability. Based on the analysis of Doppler fire control radar working principle, Doppler fire control radar countermeasures strategy is brought up. The repeater jamming technology applied to the ship-to-ship missile, aiming at Doppler fire control radar, and its application conditions are lucubrated. The research has positive significance to the weapon equipment development and operational application.