Abstract: The relation between parameters (including dynamic range, uniformity of diffraction efficiency and Bragg selectivity), Which will affect the performance of highdensity volume holographic storage, and geometric conffiguration is discussed. The importance of the three parameters of balanced consideration in the beampath configuration is emphasized. According to the analysis of LiNbO3 crystal with the principle of the balance, it is pointed out that the 90° writing beampath with Olight coupling is the best geometic configuration.