To control incident electromagnetic waves and reduce RCS，this study used the PB geometric phase theory to design various semi-circular cross-arm-shaped element structures with different rotation angles and optimized the arrangement of the element array using the GA algorithm. By introducing polarized and circularly polarized waves into different frequency bands，this metasurface can induce phase transitions in electromagnetic waves. Simulations were conducted on the designed metasurface array with an average RCS reduction of 16 dB for linearly polarized incident waves and 10 dB for circularly polarized incident waves in the frequency range of 7.82-18.42 GHz. Compared with traditional metasurfaces，this design has the advantages of a wide bandwidth，high polarization conversion rate，small size，and low cost.