This paper proposes a method of combining the metasurface with antenna array to realize highgain antenna array with simultaneous low backward scatterings. The metasurface composed of multilayered structure is characterized by allowing the xpolarized wave to transmit the ypolarized wave to reflect. Therefore, the radiation from an xpolarized antenna array can pass through the metasurface, and at the same time, diffusion scattering occurs when the outofphase metaatoms are used to form the checkerboard or random arrangement. The simulated results show that a peak gain of 18.8 dB and an operating band of around 12.5% can be obtained by the method. When the finding wave is xpolarization, the RCS of the antenna reduces by 10 dB from 9.5 GHz to 10.1 GHz and the peak reduction is 25 dB, covering the operating band of the antenna. For ypolarized incidence, 10 dB RCS reduction can be achieved from 7.8 GHz to 12 GHz, and the peak reduction is over 35 dB. The measured results are identical with the simulated results. The proposed design method can reduce the RCS effectively by using the transmissionreflectionselective metasurface, and the abovementioned provides lowscattering antenna design with a new path.