Aiming at the active angle deception decoys that may appear in the process of high-altitude and high-speed target detection, a comprehensive and theoretical analysis of the dynamics characteristics was presented, the dynamics equation of active decoy was derived, and the conservation of mechanical energy and moment of momentum of the decoy were analyzed. Theoretical analysis and simulation experiments show that the dynamic characteristics of the azimuth active decoy with fixed angle deception are completely consistent with the real target, and it is impossible to distinguish the true from the false in dynamics. In addition, other angle deception active false targets do not meet the elliptic orbit characteristics of high-altitude high-speed targets and the law of conservation of dynamics. This difference can be used to identify the false targets in the data processing layer.