The present invention provides a charging method, including: a mobility management network element obtaining charging policy information of a terminal from a user subscription data network element; an access network element obtaining the charging policy information of the terminal from the mobility management network element; and the access network element storing the charging policy information of the terminal, and charging for services of the terminal according to the charging policy information. Accordingly, the present invention also provides a charging system, an access network element and a mobility management network element. The technical scheme of the present invention can send the charging policy information to the radio side network element in the LIPA structure to realize the dynamic charging based on users of services; and it can cover the LTE network and the 3G network at the same time.