The development of embedded technology and modern communications technology, together with the emergence of a new generation of communications standards, makes the use of smart mobile devices for mobile computing possible. This paper presents a data synchronization method in physical isolation environment for mobile applications，introduces the background of the application, designs the overall scheme of the synchronization system, explains the sync process and steps, and describes the conflict detection and elimination in detail. With an incremental approach, the volume of data exchange is reduced, and data security is ensured .