A method for a network side to logout a mobile station (MS) in an idle mode is provided. The method includes receiving, by a paging agent of network side entities, a location update request message carrying a power-off indication sent from the MS; sending, by the paging agent, a location update confirm message, to an anchor paging controller/location register of the network side entities. According to the location update confirm message, the anchor paging controller/location register triggers at least one network side entity of the network side entities to release resources associated with the MS and delete a context of the MS stored in the at least one network side entity. Accordingly, the system resources are saved.