A scattering polarizer is prepared by using polymer networks formed from an amorphous monomer, nematic liquid crystals and polyimide-coated ITO glass substrates. The polyimide layers are rubbed with anti-parallel directions, thus liquid crystal molecules with homogeneous alignment along the direction of rubbing can be obtained, and further stabilized by polymer networks. Due to electro-optical properties of polymer network liquid crystals, and impinging polarized beam is scattered or transmitted depending on its polarization direction parallel or perpendicular to that of rubbing, respectively. In the parallel case, light scattering intensity can be adjusted greatly under low electric field; in the perpendicular case, light transmission is very high and hardly adjusted electrically. This kind of device combining with a linear polarizer can be switched in a high contrast ratio and fast response. The detail fabrication process is presented, and the experimental results are given and discussed.