Abstract: A method and a system for mobile terminals to share a storage space, in which a mobile terminal may apply for a shared file space on the network side, and the shared file space may be accessed by the mobile terminal itself or other mobile terminals. In the invention, a mobile terminal applies to a network side server for a shared storage space, and if the application is valid, the network side server allocates a shared storage space to the mobile terminal and generates authentication information or acquires authentication information from the mobile terminal; the mobile terminal or other mobile terminals may read or write from/to the shared storage space via the authentication information. The network side server will automatically release the space after a preset duration of time has expired or the space is released when the mobile terminal that applies for the space submits a release request.