Due to the universality of Cellular Automaton(CA) model,many applications have been found in traditional cryptography and image processing.Combined with Cellular Automaton Transform (CAT) compression technologies,an image encryption approach with enhanced security and more larger key space at least 2^H×2⁵¹²×2^{33 554 432} is proposed based on sequential CA.The simulation results show that the proposed scheme has the advantages of convenient realization,avalanche effect,confusion and diffusion properties,and low cost,which is suitable for optical realization based on the characteristics of simple parallelism structure of sequential CA,very large security key space and fast encryption speed.