Based on aerodynamic characteristics of missiles with a deflected angle of forehead at the Mach 0.35 and deflection angle from 0 degree to 5 degrees by numerical simulation. Through the study, it is found that the deflection of head leads to the change of the pressure center and the generation of lateral forces which make the projectile deviate from the original trajectory. As the dec lination increases, the pressure center first moves toward the head, when the angle further increases, the pressure center stops to move forward. The existence of amakes the drag coefficient increases, while the Z-force coefficient has no change basically.