In order to achieve one-dimensional small-caliber ammunition trajectory correction, this paper proposed a new mechanism which correct trajectory by increasing resistance. The ADAMS software was used to its mechanism motion characteristics. The FLUENT software was used to simulate aerodynamic characteristics of a grenade equipped with this mechanism. The particle trajectory equation procedure estimates its correction procedures. Simulation results show that this correction mechanism unfolds faster; increasing resistance force is obvious, fixed distance meets the need. The practical application of the institution provides data for reference. This paper provides data for reference in practical application.