Abstract: Proposing a security steganographic model which do not carry secret information based on digital image scaling.The secret information was deduced by using image scaling algorithm,rather than directly embedded in the carrier image.Firstly,selected the carrier image,zoomed it to a certain multiple through the appropriate algorithm,then found out the relevance of the pixel information between secret image and a new image,finally reduced to the original image size for transmission.Since the scheme did not directly modify the image content,the hidden performance was better.Experiments show that the method is simple,computation is safe,and embedded information is convenient to be extracted,meeting the non-detection of hidden information and adapting to image concealed communication.