Abstract: Polarization phased array antenna is adopted to overcome the loss of the received signal because common phased array exists antenna mismatch.Beamformer of polarization phased array radar in the case of completely polarized is analyzed.Polarized and spatial domains joint matching filter is proposed.The beamforming formula of polarization phased array is calculated.Polarization phased array radar is better than common phased array radar,because it controls the main beam direction, low side beam, and polarization information as well. It compensates the echo signal in polarization and increases the target signal, enhances signal to noise ratio.The example analysis and simulation results show the correctness of the theory model.