Abstract: A single error angle model of seeker’s pointing angle is proposed first, which is different from two error angle model in that it’s easy to analyzed the beam pointing error by just analyzing the single error angle. The optimal geomet rical position between the missile and the target at handover is derived in order to minimizes the pointing error by applying linear transformation, and the optimal geomet rical position at handover which minimize the Doppler frequency error is also obtained. The performance of handover is benchmarked by the probability of interception, which includes three parts, the probability of detection, the probability of the Doppler frequency falling in the bandwidth of Doppler filter and the probability of the target falling in the main lobe of the beam. The probability of interception is influenced by geomet rical position between target and missile, including the range and the line of sight. Finally asimple but typical situation is analyzed to illust rate the relation between the geomet rical position and the probability of interception.