To evaluate the performance of floating Icosahedrons triangular trihedral corner reflectors,this paper simulates the RCS of the standard icosahedrons triangular trihedral corner reflectors and the icosahedrons triangular trihedral corner reflectors with angle error state under the irradiation of radar waves with different frequencies,and obtains the scattering distribution characteristics of these two corner reflectors and the influence on the RCS mean by RCS mean characteristics and frequency. The analysis shows that the angle errors have a huge impact on the scattering characteristics of corner reflectors,and significantly reduce the performance of the corner reflectors. The research results can provide important support for subsequent engineering practices.