Abstract: A method and a system for subscribing presence information, a resource list server, and a presence server are disclosed. The method for subscribing presence information includes: determining a presentity list of a first user, where the presentity list of the first user includes a second user; determining an existing subscription session that includes information of the second user, and sending a watcher list of the second user to a presence server; and receiving presence information returned by the presence server, where the presence information is presented by the second user to watchers in the watcher list of the second user. The resource list server converts the watcher's presentity list for different presentities into the presentity's watcher list for different watchers, and the presence information can be returned to different watchers through only one subscription session, which reduces subscription sessions and saves system resources.