The electronic countermeasure reconnaissance satellite has its unique advantages in the electronic signal reconnaissance of the search and warning radar.Previous studies have focused more on the revisit period and coverage of satellite,lack of quantitative analysis of satellite signal reconnaissance capability.By analizing the power density distribution of ship radar signal in space,the reconnaissance model of ECM reconnaissance satellite for search and warning radar on sea is constructed.The data of three typical radars are brought into the model and simulated,and durations of reconnaissance are analyzed.Finally,some suggestions for further are put forward.