Abstract: A LACP negotiation processing method, relay node, and system. A relay node receives LACP packets; the relay node determines first link information between the relay node and a first node and second link information between the relay node and a second node according to the LACP packets; the relay node establishes a correspondence between the first link information and the second link information; the relay node forwards the LACP packets according to the correspondence, so that the second node performs negotiation with the first node to establish a link aggregation group. According to the embodiments of the present invention, effective negotiation can be performed between indirectly connected nodes to establish an LACP link aggregation group, and based on the established link aggregation group, load sharing is implemented for data packets in the link aggregation group.