To optimize bullet design, Solidworks was used to simplify overall structure of bullet and establish numerical simulation with Boolean operation, ICEM CFD generated mesh of this model, and simulation was performed by Fluent for outer flow field to obtain drag coefficient, life coefficient, pitching moment coefficient and center of pressure coefficient at different angles and different Mach number. The result shows that the aerodynamic characteristics of a controlled bullet are in critical point for statically stable, which is consistent with the test results, so it is need to optimize the structure by changing the shape or structure of the projectile centroid.