Abstract: An analysis method was proposed to investigate control effect of a class of fixed canard dual-spin projectile based on mass point modified trajectory model. With the roll angle of forward body regarded as control input, 6 DOF exterior ballistic model was constructed in the earth fixed coordinate system. Yaw of repose equations were derived for constant canard roll angle, and mass point modified trajectory model was obtained. Calculation formulas of range correction acceleration and cross range correction acceleration were presented, and the definition of the dominant correction coefficient was proposed. Influence of the dominant correction coefficient on correction direction and correction distance was investigated, and the results show that coefficient was one of the key factors for determining the control effect of fixed canard dual-spin projectile. Simulation examples demonstrate that the angle of attack can be approximated by yaw of repose, and position results are close for 6 DOF exterior ballistic model and mass point modified trajectory model.