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In the process of the image information hiding, the secret image should be pretreated by used of chaos sequences which are produced by chaos system, in order to improve the robustness of the algorithm. Some popular algorithms can be utilized to solve it, for example, the Logistic map could produce the chaos sequences to complete the image pretreated. But, the security of the unidimensional chaos system is weak because the system is a common chaotic encryption system. In this paper, a compound encryption algorithm of a double unidimensional chaos system is recommended according to the ten-thousand-year experience of human, the algorithm is designed by used of two unidimensional chaos sequences to encrypt the places and grey of the pixels respectively. In order to implement the information hiding in wavelet domain conveniently, the algorithm is based on non-uniform B-spline wavelet. The experiments testify that this algorithm possessed the merit of strong robust and drawing blindly.