The research status of dynamic stability for controlled and uncontrolled projectiles was discussed briefly Aiming at the antiaircraft guided projectile with fins and a pair of canards, the angular motion model in its controllable trajectory was established. Based on Liapunov's direct method, the dynamic stability condition of the controllable projectile was deduced. The stability of forced vibration under the action of canards was analyzed by solving the angular motion equation. The factors which affect the stability of free motion and forced vibration were discussed respectively. The result shows that the canard parameters and angular velocity are the main factors which influence the dynamic stability of the controllable projectile and should be controlled reasonably in the process of the design of aerodynamic configuration and trajectory.