| Benefiting from the development of network technology and mobile communication technology, application based on mobile computing devices becomes more and more popular. Personal Digital Assistants(PDA), mobile phones and so on, are being used popularly to do business wherever. Application data can be downloaded to mobile hand held devices from the master database system, and can be accessed and updated offline. It synchronizes with the master database from time to time when the connection is available. Therefore, a novel technology of mobile database emerges as the times requires, and has become a dynamic and exciting topic. In mobile computing environment, it is essential to hold data on both the sides with the consistent state. Synchronization is used to achieve consistency. The synchronization and replication is also a critical technology of mobile database. Now various proprietary synchronization frameworks have been proposed by the researcher and database merchant. These frameworks use various proprietary protocols, but poses problems to end users, developers, service providers for their inter operability and over head in maintenance. This paper is to propose an open synchronization framework based on SyncML, a standard common synchronization protocol. It also implements an security system based on a set of encrypt mechanism, such as AES,RSA and MD5.The research on this topic is very important both theoretically and practically.
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