A handover method, comprising: receiving, by a target access network device, a first message, wherein the first message is used for requesting to establish a resource for handing over a terminal device to the target access network device; obtaining, by the target access network device from the first message, information used for transmitting multicast data; sending, by the target access network device, a second message, wherein the second message indicates the established resource on the target access network device; receiving, by the target access network device, a first packet from a user plane network element, wherein the first packet corresponds to the information used for transmitting the multicast data; and sending, by the target access network device, the first packet to the terminal device, characterized in that the first packet comprises a first sequence number corresponding to the first packet, and the method further comprises: receiving, by the target access network device, a second packet from a source access network device, wherein the second packet corresponds to the information used for transmitting the multicast data, and the second packet comprises a second sequence number corresponding to the second packet, wherein the sending, by the target access network device, the first packet to the terminal device comprises: in response to the first sequence number is less than or equal to the second sequence number, sending, by the target access network device, the first packet to the terminal device, wherein before sending, by the target access network device, the first packet to the terminal device, the method further comprises: in response to the first sequence number is greater than the second sequence number, sending, by the target access network device, the second packet to the terminal device. receiving, by a target access network device, a first message, wherein the first message is used for requesting to establish a resource for handing over a terminal device to the target access network device; obtaining, by the target access network device from the first message, information used for transmitting multicast data; sending, by the target access network device, a second message, wherein the second message indicates the established resource on the target access network device; receiving, by the target access network device, a first packet from a user plane network element, wherein the first packet corresponds to the information used for transmitting the multicast data; and sending, by the target access network device, the first packet to the terminal device, characterized in that the first packet comprises a first sequence number corresponding to the first packet, and the method further comprises: receiving, by the target access network device, a second packet from a source access network device, wherein the second packet corresponds to the information used for transmitting the multicast data, and the second packet comprises a second sequence number corresponding to the second packet, wherein the sending, by the target access network device, the first packet to the terminal device comprises: in response to the first sequence number is less than or equal to the second sequence number, sending, by the target access network device, the first packet to the terminal device, wherein before sending, by the target access network device, the first packet to the terminal device, the method further comprises: in response to the first sequence number is greater than the second sequence number, sending, by the target access network device, the second packet to the terminal device. receiving, by the target access network device, a second packet from a source access network device, wherein the second packet corresponds to the information used for transmitting the multicast data, and the second packet comprises a second sequence number corresponding to the second packet, wherein the sending, by the target access network device, the first packet to the terminal device comprises: in response to the first sequence number is less than or equal to the second sequence number, sending, by the target access network device, the first packet to the terminal device, wherein before sending, by the target access network device, the first packet to the terminal device, the method further comprises: in response to the first sequence number is greater than the second sequence number, sending, by the target access network device, the second packet to the terminal device. in response to the first sequence number is less than or equal to the second sequence number, sending, by the target access network device, the first packet to the terminal device, wherein before sending, by the target access network device, the first packet to the terminal device, the method further comprises: in response to the first sequence number is greater than the second sequence number, sending, by the target access network device, the second packet to the terminal device.