This invention relates to a method for publishing presence information, including: receiving, by a presence server, a message carrying presence information to be published sent from a delegated presentity client or application server; publishing the presence information in the message carrying presence information to be published according to delegation authorization rules upon determining that the presence information is published by delegation; sending the processed presence information to a watcher client. This invention also provides, a presence server and a presence information composing and publishing unit for publishing presence information. The invention makes it more flexible to publish presence information and enhances user' experience.