The present invention provides a file synchronization method, an electronic device and a synchronization system. Operating content performed on a first file in a first system is sent to a second system via a data information channel between the first system and the second system when the first file is changed. A second file processing program in the second system performs a synchronization processing on a second file according to the operating content, the second file being a file corresponding to the first file in the second system. With the above technical solutions, a real-time synchronization/updating may be performed on same files in different systems.