The invention discloses a home agent clustering system and a deployment method thereof, wherein the deployment method comprises the process of accessing nodes into home agents and comprises the following processing steps: a service router distributes terminal address pools for each home agent of the home agent clustering system; the service router determines routing addresses when the nodes are accessed to the home agents and determines that the home agents which correspond to the routing addresses are service home agents according to the terminal address pools; and the service router routes messages sent by the nodes to the service home agents so as to complete access from the nodes to the service home agents. The invention can reduce the networking difficulty of the home agent clustering system and the establishment cost of the home agent clustering system.