Steganography is an important issue in the filed of information safety. This paper concretely designs and carries out a steganography of the text secret information. The introduction of chaos theory conveniences to the test of steganography characteristics and enhance the safe of steganography. Adopting an improvement type BPCS steganography, this scheme can resist the analysis of the steganalysis. Results show that the design of the paper has certain of application value.