The embodiment of the invention, which relates to the communication field, provides a business switching method and system. With the method and system, a problem that business switching is not supported when a fault occurs at a server in the prior art can be solved. The method is applied to a cluster system including a source server, a target server, and a client. The method comprises: the source server sends target handle information to the target server; the source server sends an identifier of the target handle information to the client, wherein the identifier is used for unique identification of the target handle information; and when a fault occurs at the source server or a network between the source server and the client is cut off, the target server provides the target handle information according to the identifier sent by the client. The business switching method and system are applied to a fault scene of a source server or a scene of disconnection of a network between the source server and the client.