The present invention provides a method and apparatus for establishing a chat group. The method performed by a server includes: obtaining an identifier of a user of a first client terminal, an identifier of a chat group to be established and a geographic position of the first terminal; beginning to establish a chat group; selecting at least one second client terminal from a predetermined geographic scope; and inviting a user of the at least one second client terminal to the chat group; receiving authentication information input by the user of the second client terminal from the second client terminal; determining whether the authentication information is correct; if the authentication information is correct, adding the user of the second client terminal into the chat group; and sending information of the second user to the first client terminal; finishing establishing the chat group when a preset finish condition is met.