In anti-missile defense system, when the interceptor intercepts ballistic missile targets under spacebased infrared loworbit satellite information guidance, the matching problem about the satellite tracking ability and the interceptor’s intercepting ability need to be considered. Firstly, the ability of satellite tracking ballistic missile targets is calculated using the method of posterior CramerRao lower bound. Then error of trajectory is predicted by the elliptic orbit linearization equation. Based on the target’s prediction trajectory and the interceptor’s flight performance, the calculation method of predict intercept point and its error is established. The effect of predict intercept point error on the interceptor’s midcourse flight modification ability is analyzed by the uniform ignition strategy. The interceptor’s endgame flight modification ability is calculated by the credibility theory. Finally, the technical requirement for loworbit satellites that meet the interceptor’s midcourse and endgame flight modification ability is obtained by simulation.