An information encryption method using CGH is presented in this paper. In this method, the encryption information is divided into two parts and recorded on two CGHs, respectively, the phase of wave recorded on each CGH has been coded according to the recording information and distributing randomly. When a single CGH is reconstructed, no information will be observed, while two alignment combining CGHs are reconstructed, the original information will be observed in the interference patterns of the two reconstructed waves. Information can be read out only when two holograms are matched, which ensure hologram a high encryption ability.