A peer-to-peer communication charging method for charging instant messaging services in a peer-to-peer network, includes the steps of: a) sending, by a service application server to a charging system, an application layer charging message including application layer charging information, a subsystem layer charging correlation identifier and/or a bearer layer charging correlation identifier; b) sending, by a subsystem layer to the charging system, a subsystem layer charging message including subsystem layer charging information, the subsystem layer charging correlation identifier and the bearer layer charging correlation identifier; c) sending, by a bearer layer to the charging system, a bearer layer charging message including bearer layer charging information, the subsystem layer charging correlation identifier and the bearer layer charging correlation identifier; and e) associating, by the charging system, the received charging messages with one another and performing charging.