A link aggregation method, device, MAC frame receiving/sending method and system are disclosed. The link aggregation method includes that the systems at both terminals of link transmit the information of ports owned VLAN in the local terminal system to the opposite terminal system by interchanging the message; the systems at both terminals of link determines link owned VLAN separately according to the received information of port owned VLAN in the opposite terminal system and the local terminal system, and aggregate the link according to the link owned VLAN. The MAC frame receiving/sending method includes that the sending terminal obtains VLAN information of the MAC frame, and VLAN information of link in the link aggregation group; the sending terminal selects the link sending MAC frame in the link which has the same VLAN with the MAC frame, and sends the MAC frame to the receiving terminal by said selected link; the receiving terminal sends the MAC frame received to MAC client. The implement of the solution improves the netting flexibility and the facility of network design and maintenance and management; and MAC frame with VLAN tag can be distributed on the corresponding VLAN link quickly, correctly, conveniently.