In order to improve the aerodynamic efficiency of the fixed duck rudder bomb, the structure design and aerodynamic characteristics analysis of the guided grenade trajectory correction component are carried out. Based on the 155 mm caliber grenade, three types of canard rudders are designed, and the three types of rudder blades are simulated by numerical simulation software. The three design schemes are compared with the rolling torque and lift-drag ratio for optimization, and the influence of different installation positions on the aerodynamic characteristics is analyzed, and the duck rudder shape and axial layout with relatively good aerodynamic efficiency are obtained. The results show that the design has certain engineering application value and can provide a reference for the aerodynamic design of simple guided grenade based on the canard rudder.