The invention discloses a method and system for loading large-capacity user service information, wherein the method is used for the short message centre, and includes: setting the shared memory of user data for buffering the user service information; setting the timing service, and leading out the user service information from the the user database to the data back-up file; setting the timer forinforming the loading; recieving the loading inform information, and judging whether the data is needed to be loaded, the data loaded if needed, or judging the data in the user data shared memory is full and efficient, the finishing flow of shared memory data being organized and treated afresh if it is, or loading the user service information from the data back-up file to the user data shared memory; organizing and treating for the user service information led into the user data shared memory, reading the recieved the data of data synchronous file, and correcting the user service informationon the user data shared memory. The invention solves the problems that the user data has slow loading speed and the user data needs to be loaded again by the fault at present.