A new method for optimization of the holographic waveguide plate in a holographic waveguide display is proposed according to theoretical analysis,calculations and manufacture difficulty level.A waveguide plate for a holographic waveguide display system,with 28° field of view and a large exit pupil about 30 mm×30 mm,is optimized by this method.The performances of this holographic waveguide display system can be satisfied by an input holographic grating of 5 mm×30 mm,an output holographic grating of 30 mm×30 mm,together with a glass(BaK7) waveguide of 3 mm thickness,which is divided into two waveguides,one has 0.75 mm thickness and another 2.25 mm,by the beam splitter.This configuration can be applied to a Head-Mounted Display(HMD) or a Head-Up Display(HUD).