After the target is detected by the detection system of intelligent mine, the top-attack submunition is launched by main mine. After the target is identified by sensor, the top-attack submunition emits explosively formed projection (EFP) to attack the target. Due to the attacking process is finished rapidly and complicatedly, the analysis on the impact accuracy of EFP becomes very important. According to the study on kinematics principle, the calculation model based on relative position of top-attack submunition, EFP and target was formed. The results of calculation shows that flight state of top-attack submunition, performance of sensor and motion state of target can influence the impact accuracy of EFP. The study results lay the theoretical foundation for overall design of intelligent mine.