The paper established the coupling differential equations using the band-transport model. Using practical experiment's parameters,we numerically calculated and explained the time-dynamic developing process of the holographic storage,and analyzed how the oxidation-reduction degree of the crystal affects the space charge field within the crystal. Only the oxidative crystals can accomplish nonvolatile holographic storage,which its diffraction efficiency after red-light read-out increases with the increase of oxidative degree. Further more we measured the diffraction efficiencies of four specimens with different degree of oxidation-reduction and did comparable experiments of two-wave coupling between reductive crystals and oxidative crystals. The experimental results coincided with the theoretical analysis very well. At the same time,holographic dynamic range M/# and recording sensitivity of oxidative crystal was quantitatively calculated by using experimental curve in which value of M/# equaled to 5.03 (extraordinary light,wavelength,632 nm),but trade off with lower sensitivity.