Abstract: The corner structure strongly reflects the incident electromagnetic waves. Some inevitable corner structure on the equipment platform usually results in a large radar cross section (RCS), which goes against stealth and survival. In order to realize the stealth design of the corner reflector structure, this paper proposes a mono-static RCS reduction design method based on phase cancellation. Firstly, the principle of RCS reduction of dihedral corner reflector (DCR) based on phase cancellation surface is analyzed. Two metasurfaces are designed which have 180±37° phase differences in the broad bandwidth of 7.6−17.6 GHz, forming the checkerboard structure and reducing the specular scattering of the planar structure. The checkerboard metasurface is applied to the inner wall of the DCR, and can reduce the mono-static RCS over the whole X and Ku band without changing the shape of the corner structure. The maximum RCS reduction is 29.5 dB. Simulations and measurements verify the RCS reduction of the DCR.