This invention relates to a method for grouping ring network for increasing the service resuming ability and a service protection method including setting up a master ring network containing several network nodes and setting up a backup ring network based on the part of the network nodes in the master ring network, then judging if the protection channel on the master one is available after the working channel is invalid on the master ring network, if so, the protection channel is used to protect the invalid working channel directly, otherwise, the protection channel on the backup ring networkis used to protect the invalid working channel on the master ring network