A soft handover method, comprising: receiving (201, 1d, 2d, 4d), by a home access gateway, a soft handover request sent by a home access node, wherein the soft handover request comprises user plane information of the home access node and an identifier of a radio network controller, RNC, wherein the user plane information of the home access node comprises a user plane internet protocol, IP, address and a user datagram protocol, UDP, port number; establishing (202, 1e, 2e, 4e), by the home access gateway according to the identifier of the RNC, a signaling connection mapping between the home access node and the RNC, and forwarding the soft handover request to the RNC based on forwarding connection resource information allocated to the RNC, wherein the forwarding connection resource information comprises a user plane IP address and a UDP port number that point to the home access gateway if a link medium between the home access gateway and the RNC is IP over Ethernet, or the forwarding connection resource information comprises a channel identifier that points to the home access gateway and is needed to establish an Asynchronous Transfer Mode, ATM, adaptation layer type 2, AAL2, link if a link medium between the home access gateway and the RNC is ATM; receiving (203, 1g, 2g, 4g), by the home access gateway, a soft handover response returned by the RNC according to the soft handover request, wherein the soft handover response comprises connection resource information of the RNC, wherein the connection resource information of the RNC mainly comprises a user plane IP address and a UDP port number of the RNC if the link medium between the home access gateway and the RNC is IP over Ethernet, or the connection resource information of the RNC comprises a channel identifier which is needed to establish an AAL2 link if the link medium between the home access gateway and the RNC is ATM; and establishing (204, 1h, 2h, 4h), by the home access gateway, a user plane connection mapping between the home access node and the RNC according to the user plane information of the home access node, the forwarding connection resource information, forwarding user plane information allocated to the home access node, and the connection resource information of the RNC, and forwarding the soft handover response to the home access node based on the forwarding user plane information, wherein the forwarding user plane information comprises a user plane IP address and a UDP port number that point to the home access gateway. receiving (201, 1d, 2d, 4d), by a home access gateway, a soft handover request sent by a home access node, wherein the soft handover request comprises user plane information of the home access node and an identifier of a radio network controller, RNC, wherein the user plane information of the home access node comprises a user plane internet protocol, IP, address and a user datagram protocol, UDP, port number; establishing (202, 1e, 2e, 4e), by the home access gateway according to the identifier of the RNC, a signaling connection mapping between the home access node and the RNC, and forwarding the soft handover request to the RNC based on forwarding connection resource information allocated to the RNC, wherein the forwarding connection resource information comprises a user plane IP address and a UDP port number that point to the home access gateway if a link medium between the home access gateway and the RNC is IP over Ethernet, or the forwarding connection resource information comprises a channel identifier that points to the home access gateway and is needed to establish an Asynchronous Transfer Mode, ATM, adaptation layer type 2, AAL2, link if a link medium between the home access gateway and the RNC is ATM; receiving (203, 1g, 2g, 4g), by the home access gateway, a soft handover response returned by the RNC according to the soft handover request, wherein the soft handover response comprises connection resource information of the RNC, wherein the connection resource information of the RNC mainly comprises a user plane IP address and a UDP port number of the RNC if the link medium between the home access gateway and the RNC is IP over Ethernet, or the connection resource information of the RNC comprises a channel identifier which is needed to establish an AAL2 link if the link medium between the home access gateway and the RNC is ATM; and establishing (204, 1h, 2h, 4h), by the home access gateway, a user plane connection mapping between the home access node and the RNC according to the user plane information of the home access node, the forwarding connection resource information, forwarding user plane information allocated to the home access node, and the connection resource information of the RNC, and forwarding the soft handover response to the home access node based on the forwarding user plane information, wherein the forwarding user plane information comprises a user plane IP address and a UDP port number that point to the home access gateway.