In order to improve the hitting accuracy of guns and bullets, the numerical calculation of the aerodynamic characteristics of a new extended range smart bullet is analyzed. Establish a bullet calculation model and apply the pneumatic simulation software FLUENT. The influence of the shape of warhead and tail on the aerodynamic characteristics of smart bullet is analyzed by numerical simulation and validated on the basis of foreign bullets. The simulation results show that this method is correct and it can provide reference for the analysis of the aerodynamic characteristics of projectiles. With the increase of tip radius, the drag coefficient increases, the lift coefficient increases first and then decreases, and the pitching moment coefficient decreases first and then increases. With the increase of arc radius, the drag coefficient increases, the lift coefficient decreases, the pitching moment coefficient increases, and the longitudinal static stability decreases. With the increase of the radius at the intersection, the drag coefficient decreases, the lift coefficient decreases, the pitching moment coefficient increases, and the static stability decreases.