随着计算机网络及各种数字作品制作技术的迅速发展，信息隐藏技术越来越受到人们的关注。本文在分析了已有置乱方法优缺点的基础上，提出了图像的二级置乱法。它改进了原有方法中变换矩阵的形式，分别对原始图像的位置和灰度级进行不同类型的置乱，既改变了图像的纹理信息又改变了图像的统计特性，使其仅经过一次迭代就可以达到满意的效果。与其他方法相比，其计算量相对较小，且增强了图像的保密性，提高了保密信息的迷惑性，减小了攻击者的注意力。通过仿真实验证明，该方法具有较好的实用性。

More and more people pay attention to the technology of information hiding because of the development of Internet and digital work.In the paper,a new scrambling method is introduced after analyzing the advantages and disadvantages of some other information hiding methods.It modifies the form of transformation matrix that is used to scramble the position and gray level of each pixel.This method changes not only the texture but also the statistical property of an image.Compared with other approaches,it has the following advantages: It improves the secrecy property of an image and reduces the attacker's notice;It has the less calculated capacity.Simulations show that it is practicable.