By sensitizing with 514 nm green light, 488 nm blue light and 390 nm ultraviolet light respectively, recording with 633 nm red light, the effect of wavelength of sensitizing light on holographic storage properties of oxidized (Fe,Ni):LiNbO3 crystal is investigated in detail. It is shown that by shortening the wavelength of sensitizing light gradually, nonvolatile holographic recording properties of oxidized (Fe,Ni):LiNbO3 crystal is optimized gradually, and 390 nm ultraviolet light is found to be the best among the three kinds of sensitizing light. Considering the absorption of sensitizing light, appropriate sensitizing light wavelength should be adopted to obtain the best performance in two-center holographic recording. On one hand the sensitizing light with short wavelength can sensitize the deep center effectively, on the other hand the absorption is too strong, for example the substrate absorption which is useless for photorefraction, to allow valid sensitization in the thickness direction. So in practice a trade-off is always needed. Explanation is also presented theoretically.