In view of steganography and anti steganalysis ability requirements, the zerosteganography techniques to hide information is proposed, and the theoretical model based on the sample type zerosteganography is derived. In addition, the robustness and pretreatment of the steganography is analyzed，considering the discrete cosine transform(DCT) and chaotic sequence of their respective advantages,the zerosteganography algorithm of pictures based on PCT trans form and chaotic sequence is put forward. The method hides the payload based on relationship between the cover image dct dc coefficient and the payload preprocessing encryption, instead of directly embedding payload into the cover image. The results under MATLAB environment show that the proposed algorithm has a large embedding capacity, strong robustness, and great ability to resist steganalysis analysis.