A carrier configuration method for a multi-carrier communication system having a base station (BS) and a terminal is described. The BS divides multiple component carriers (CCs) of the terminal to multiple CC groups, wherein the CCs using at least one identical configuration parameter are divided into the same CC group. The BS transmits a CC configuration message comprising at least one configuration parameter data to the terminal, wherein the configuration message comprises or does not comprise at least one CC configuration indicator. If the configuration message comprises the CC configuration indicator, the terminal will receive the CC configuration message, and configure the configuration parameter of the configurations of the CCs indicated by the CC configuration indicator according to the configuration parameter data; otherwise, the terminal will configure the configuration parameter of the configurations of the default CCs (e.g. all of the CCs currently used by the terminal, or primary CCs).