A service protection method and system for a composite link comprising two or more member links are provided. The system includes: a node of each member link, which is configured to detect a link state of the member link and send a notification message to a control unit of the composite link when detecting that services of the member link are congested or bandwidth thereof changes; a control unit on the first node of the composite link, which is configured to adjust service traffic distributed to the member link according to information carried in the notification message. When the services of a certain member link are congested or the bandwidth thereof is decreased, in the present invention, it is no longer to switch all the services of the member link to other links, so as to be able to continuously use the original member link, which not only protects the affected part of services but also effectively utilizes the bandwidth of the member link. In addition, when the bandwidth of a certain member link is recovered, the service distribution can be recovered as well.
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