The embodiment of the invention provides a multi-session channel establishment method and system, and relates to the field of communication. The problem of low throughput of a network transmission bandwidth of a node and a client caused by the limited number of network cards of the node in the prior art is solved. The method comprises the following steps: a source node receives a first inquiry message sent by the client; the source node sends network card information of at least one network card contained in each node to the client; and a target node establishes a session channel between the target node and the client through a target network card according to a connection establishment request sent by the client, wherein the target node is a node where the target network card is located, and the target network card is a network card selected by the client from the at least one network card contained in each node according to the network card information of at least one network card contained in each node. The multi-session channel establishment method and system provided by the embodiment of the invention is applied to a node fault switching scene in a cluster system.