A carrier bearing method, comprising: obtaining transmit power of each carrier borne on all power amplifiers in a radio remote unit after detecting that transmit power of a carrier borne on a power amplifier in the radio remote unit changes; adjusting a correspondence between the carriers and the power amplifier in the radio remote unit according to the obtained transmit power, to make total input power required by all the power amplifiers in the radio remote unit under the adjusted correspondence to be minimum; bearing each carrier on its corresponding power amplifier according to the adjusted correspondence; wherein the number of carriers borne on all the power amplifiers in the radio remote unit is f, wherein f is an integer larger than 1; and the step of adjusting the correspondence according to the obtained transmit power comprises: calculating the total input power of all the power amplifiers under each of n correspondences between the carriers and the power amplifiers, wherein n is an integer smaller than or equal to p f, and p is the total number of power amplifiers in the radio remote unit and is an integer larger than 1; and obtaining a correspondence between the carriers and the power amplifier that is corresponding to a minimum total input power among n total input power values, wherein the correspondence between the carriers and the power amplifier is the adjusted correspondence. obtaining transmit power of each carrier borne on all power amplifiers in a radio remote unit after detecting that transmit power of a carrier borne on a power amplifier in the radio remote unit changes; adjusting a correspondence between the carriers and the power amplifier in the radio remote unit according to the obtained transmit power, to make total input power required by all the power amplifiers in the radio remote unit under the adjusted correspondence to be minimum; bearing each carrier on its corresponding power amplifier according to the adjusted correspondence; wherein the number of carriers borne on all the power amplifiers in the radio remote unit is f, wherein f is an integer larger than 1; and the step of adjusting the correspondence according to the obtained transmit power comprises: calculating the total input power of all the power amplifiers under each of n correspondences between the carriers and the power amplifiers, wherein n is an integer smaller than or equal to p f, and p is the total number of power amplifiers in the radio remote unit and is an integer larger than 1; and obtaining a correspondence between the carriers and the power amplifier that is corresponding to a minimum total input power among n total input power values, wherein the correspondence between the carriers and the power amplifier is the adjusted correspondence. calculating the total input power of all the power amplifiers under each of n correspondences between the carriers and the power amplifiers, wherein n is an integer smaller than or equal to p f, and p is the total number of power amplifiers in the radio remote unit and is an integer larger than 1; and obtaining a correspondence between the carriers and the power amplifier that is corresponding to a minimum total input power among n total input power values, wherein the correspondence between the carriers and the power amplifier is the adjusted correspondence.