Abstract: In this paper, a one-dimensional composite hybrid system is constructed in series and in parallel according to three one-dimensional mapping, and the optimization and improvement are put forward in combination with the compression-aware theory. The improved algorithm is simulated with two image gray levels of 256 The experimental and simulation results show that the improved algorithm has good anti-interference ability. Through the comparison and analysis of the original image and the encrypted image in histogram, the correlation coefficient of adjacent pixels and so on, it can be seen that the proposed encryption algorithm has a very good effect.