The problem of projectile attitude control with inertial rotor gyroscope as actuator is studied. In order to better study the influence of the rotor gyroscope mechanism on the projectile, firstly, the gyroscope approximation theory is used to analyze the influence of the gyroscope moment on the flying attitude of the projectile. Secondly, the dynamic model of rotor gyroscope is established, and the control scheme is theoretically feasible from the moment of momentum theorem of gyroscope. Finally, the influence of precession performance of rotor gyroscope on ballistic characteristics is verified. The attitude dynamics model of the projectile controlled by the rotor is established and the numerical simulation is carried out. The simulation results show that the range and deviation of the projectile can be affected by the rotor gyroscope as the actuator. Therefore, it is proved that the research on the attitude control of projectiles by inertial rotor gyroscope is feasible.