As a new type of electronic warfare equipment, the research on the operational use of floating corner reflector is basically blank. To correctly grasp the using time, a method to determine the effective interference distance of centroid jamming is put forward, and the timing of the centroid jamming under different operational backgrounds is analyzed. The methods are verified through simulation using two typical anti-ship missiles of subsonic and supersonic respectively, and the simulation results are consistent with the theoretical calculation. It provides a theoretical basis for the application of floating angle reflectors.