The present invention discloses an application charging method. The method includes receiving, by a CTF device, a charging rule of an application from a PCRF device, wherein the charging rule of the application carries an application identifier and charging rule parameters of the application, executing the charging rule of the application, and detecting, according to an application identifier, a flow of the application transmitted on one or more bearers, sending, by the CTF device according to charging rule parameters of the application, a charging session establishment request to a charging system and establishing a charging session of the application, collecting charging information about the detected flow of the application, and sending the collected charging information about the flow of the application to the charging system by using the charging session of the application.