In the issue of the accuracy of common high speed rotating projectile accuracy was low, the numeric simulation model of projectile with canard rudder and the non rudder projectile was established. The simulation of the influence of rudder projectile on non-rudder projectile about drag, lift, rolling moment, its coefficient, range of fire and the lateral misalignment showed that on the base of projectile flight stability, in the anti rotation case, the range of projectile, the height and the transverse deflection of the rudder projectile relative to the non rudder projectile were reduced. Proper control of the canard rudder attitude could repair the range loss caused by the installation of the canard rudder mechanism and could repair the deviation of the projectile effectively.