In order to optimize the nonvolatile holographic recording in LiNbO3:Ce:Cu crystal with green light, we solved the joint two-center material equations and the coupled wave equations. Variations of parameters were analyzed, such as average space charge field (SCF) and the diffraction efficiency with the crystal annealing state, the intensity ratio of green-to-ultraviolet (UV), and the concentration of shallow and deep traps in oxidized LiNbO3:Ce:Cu crystal. The results show that strong photorefractive grating with the averaged space-charge field as high as 107 V/m and 80% high fixed diffraction efficiency can be obtained in LiNbO3:Ce:Cu with green light recording. And much better performance can be obtained by changing the corresponding parameters.