A method of the image information hiding based on two-dimensional DCT transform is proposed. After the two-dimensional DCT transform being made, the image energy concentrates in low-frequency while the high-frequency part can be regarded as vision redundant, considering the visual characteristics of the man’s eyes, the useful information can be hided in the transformation of the vector image’s high-frequency part, namely by sacrificing the image’s high frequency information to achieve the effect of information hiding. Through realizing this idea by MATLAB, the quality of the image is analyzed and the next step of the experiment is conceived.