Due to advanced development of information technologies and computer networks, delivering secret message over public computer network is more important than before. How to ensure the security of secret data delivering is an important research issue in recent years. Secret message is easy to encrypt into cipher message. An unexpected user is very hard to know the real message when who has no right decryption key. However, the secret data delivering maybe failed caused by unexpected user breaking transmission. The reason is that the cipher text (looks like random noise) attracts unexpected user pay more attention on the text. Steganography is to conceal cipher text into a cover medium and generated stego medium. After that, the stego medium is transmitted to the receiver over the public computer networks. Because the stego medium looks like normal medium, unexpected user will not pay too much attention on stego medium. Many data hiding technique by using digital image as cover medium were presented in past years. In nowadays, mobile devices became popular devices in daily life. To develop low computation cost data hiding technique is quite important research issue in the modern life. In this project, we plan to develop a data hiding scheme for HTML file. The received can easy extract secret message from stego HTML file by browsing the stego webpage and parsing the source code of stego HTML file. First, we plan to collect the special space codes and to segment cover HTML’s article into several textual segments. For every textual segment contains some space character (between-words location). Further, using Cartesian product generates the pair of special space codes. Finally, to replace the space character by using selected special space code (i.e., according to secret bits) pair to imply secret message. We image that a low computation cost data hiding scheme will be investigated.