Abstract: By analyzing the security of some nowadays adaptive steganographies,a new wet paper code(WPC) based adaptive steganography in IWT domain is proposed in order to enhance the security.The scheme calculates the threshold according to the quantity of the secrete message and the cover element's characteristic,then adaptively chooses the complex texture region as embedding position,embedding secrete data by two layer WPC steganography,and adopt a new histogram adjustment strategy to prevent distortion.By such way,the capability of resisting steganalysis is improved.Quantities of experiments show that under average embedding rate of 100%,the new algorithm behaves better in visual and statistical imperceptibility.