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Now traditional encryption is becoming more and more unsafe. So many people find information hiding technology is a good solution for security in some special area. In this paper, we design and implement a data hiding system based on the length of English text document and secret message encryption. The method that divide secret message into blocks before embedding can increase capacity. Using DES encrypt secret message greatly improves the security of the system. We implement this system using VBA, and analyses its security, capacity and availability, and then point out the feasibility and the advantages of the system.