A method for releasing an address, comprising: when releasing an Internet protocol version 6 address, a user node notifying the released IPv6 address to nodes within a scope of a local link; wherein, the nodes within the scope of the local link comprises a broadband remote access server BRAS and a neighbor user node of the user node; wherein the step of notifying the released IPv6 address to the nodes within the scope of the local link comprises: the user node sending a neighbor advertise message to the nodes within the scope of the local link, carrying the released IPv6 address in a target address field of the NA message, and indicating to the nodes within the scope of the local link that an IPv6 address in the target address field is the released IPv6 address through a CODE field of the NA message; after receiving the NA message, and judging that the IPv6 address in the target address field is the IPv6 address released by the user node according to the CODE field of the NA message, the BRAS stopping a charging operation on the user node; and after receiving the NA message and judging that the IPv6 address in the target address field is the IPv6 address released by the user node according to the CODE field of the NA message, in a case that the IPv6 address released by the user node has been set as a duplicate address, the neighbor user node of the user node resetting the IPv6 address released by the user node as an address that can be used. when releasing an Internet protocol version 6 address, a user node notifying the released IPv6 address to nodes within a scope of a local link; wherein, the nodes within the scope of the local link comprises a broadband remote access server BRAS and a neighbor user node of the user node; wherein the step of notifying the released IPv6 address to the nodes within the scope of the local link comprises: the user node sending a neighbor advertise message to the nodes within the scope of the local link, carrying the released IPv6 address in a target address field of the NA message, and indicating to the nodes within the scope of the local link that an IPv6 address in the target address field is the released IPv6 address through a CODE field of the NA message; after receiving the NA message, and judging that the IPv6 address in the target address field is the IPv6 address released by the user node according to the CODE field of the NA message, the BRAS stopping a charging operation on the user node; and after receiving the NA message and judging that the IPv6 address in the target address field is the IPv6 address released by the user node according to the CODE field of the NA message, in a case that the IPv6 address released by the user node has been set as a duplicate address, the neighbor user node of the user node resetting the IPv6 address released by the user node as an address that can be used. the user node sending a neighbor advertise message to the nodes within the scope of the local link, carrying the released IPv6 address in a target address field of the NA message, and indicating to the nodes within the scope of the local link that an IPv6 address in the target address field is the released IPv6 address through a CODE field of the NA message; after receiving the NA message, and judging that the IPv6 address in the target address field is the IPv6 address released by the user node according to the CODE field of the NA message, the BRAS stopping a charging operation on the user node; and after receiving the NA message and judging that the IPv6 address in the target address field is the IPv6 address released by the user node according to the CODE field of the NA message, in a case that the IPv6 address released by the user node has been set as a duplicate address, the neighbor user node of the user node resetting the IPv6 address released by the user node as an address that can be used.