A method for implementing a convergence system of a plurality of radio access networks, comprising: establishing, by an anchor RAN, a first connection with a user equipment, UE; selecting, by the anchor RAN, an auxiliary RAN; sending, by the anchor RAN, a quality of service, QoS, parameter to the auxiliary RAN for establishing, according to the QoS parameter, a second connection between the auxiliary RAN and the UE; and keeping, by the anchor RAN, the first connection with the UE after establishing the second connection between the auxiliary RAN and the UE; wherein the method further comprises: receiving, by the anchor RAN, a data packet from a core network; dividing, by the anchor RAN, the data packet into a first data packet and a second data packet; transmitting, by the anchor RAN, the first data packet to the UE through a packet data convergence protocol, PDCP, module which is commonly used by the anchor RAN and the auxiliary RAN, a radio link control, RLC, layer subblock of the anchor RAN, a physical, PHY, layer subblock of the anchor RAN and a media access control, MAC, layer subblock of the anchor RAN; and transmitting, by the anchor RAN, the second data packet through the PDCP module which is commonly used by the anchor RAN and the auxiliary RAN to the auxiliary RAN for sending to the UE through an MAC layer subblock of the auxiliary RAN, an PHY layer subblock of the auxiliary RAN and an RLC layer subblock of the auxiliary RAN. establishing, by an anchor RAN, a first connection with a user equipment, UE; selecting, by the anchor RAN, an auxiliary RAN; sending, by the anchor RAN, a quality of service, QoS, parameter to the auxiliary RAN for establishing, according to the QoS parameter, a second connection between the auxiliary RAN and the UE; and keeping, by the anchor RAN, the first connection with the UE after establishing the second connection between the auxiliary RAN and the UE; wherein the method further comprises: receiving, by the anchor RAN, a data packet from a core network; dividing, by the anchor RAN, the data packet into a first data packet and a second data packet; transmitting, by the anchor RAN, the first data packet to the UE through a packet data convergence protocol, PDCP, module which is commonly used by the anchor RAN and the auxiliary RAN, a radio link control, RLC, layer subblock of the anchor RAN, a physical, PHY, layer subblock of the anchor RAN and a media access control, MAC, layer subblock of the anchor RAN; and transmitting, by the anchor RAN, the second data packet through the PDCP module which is commonly used by the anchor RAN and the auxiliary RAN to the auxiliary RAN for sending to the UE through an MAC layer subblock of the auxiliary RAN, an PHY layer subblock of the auxiliary RAN and an RLC layer subblock of the auxiliary RAN. receiving, by the anchor RAN, a data packet from a core network; dividing, by the anchor RAN, the data packet into a first data packet and a second data packet; transmitting, by the anchor RAN, the first data packet to the UE through a packet data convergence protocol, PDCP, module which is commonly used by the anchor RAN and the auxiliary RAN, a radio link control, RLC, layer subblock of the anchor RAN, a physical, PHY, layer subblock of the anchor RAN and a media access control, MAC, layer subblock of the anchor RAN; and transmitting, by the anchor RAN, the second data packet through the PDCP module which is commonly used by the anchor RAN and the auxiliary RAN to the auxiliary RAN for sending to the UE through an MAC layer subblock of the auxiliary RAN, an PHY layer subblock of the auxiliary RAN and an RLC layer subblock of the auxiliary RAN.