Phase conjugation (PC) and optical storage in a liquid-crystul polymer film were studied by degenerated four-wave mixing. On the basis of resonant absorption,high-efficiency phase conjugated beam was obtained while low-intensity incident waves were used. When intensities of the waves increased to the order of 10 W/cm2, the film showed a behavior of optical storage and high- order diffraction was observed. As intensities of the incident waves reached the order of los W/cm2, three groups of backward and forward high-order diffraction beams were detected. The highest-order diffraction beam was the 3rd-order one. After turning off two of the incident waves, the high-order diffraction produced by the remained wave didn't decrease obviously. After the bleaching, a brilliant hologram spot was observed on the film and could be maintained over 120 days under general storage conditions.