Abstract: Methods of data synchronization over different platforms are discussed. It gives an example to illuminate the implementation of data synchronization over different platforms using Socket communication based B/S module under enterprise security policy in the design of Intranet automatic tools. The method utilizes fully the characteristics and advantages of Socket communication technology. The client sends a section of names to be upgraded and the server finishes the searching operation using the existing database tools and returns the new content. The local application program receives the new content and then update the local database, thus achieving the purpose of data synchronization over different platforms and different database types.