A power control method, applied to a vectoring system, wherein the vectoring system comprises multiple lines, each line comprises multiple subcarriers, and for each subcarrier, a crosstalk channel is formed between the multiple lines, wherein the method comprises: obtaining a disabled subcarrier set of the multiple lines according to line crosstalk channel information corresponding to each subcarrier of the multiple subcarriers, wherein the disabled subcarrier set comprises a subcarrier set required to be disabled on the multiple lines; and sending the disabled subcarrier set of the multiple lines to a transceiver, wherein the transceiver disables a transmit signal on a subcarrier required to be disabled on each line; wherein the obtaining a disabled subcarrier set of the multiple lines comprises: calculating, according to the line crosstalk channel information corresponding to each subcarrier, a line set required to be disabled and corresponding to each subcarrier; and searching, according to the calculated line set corresponding to each subcarrier, for a subcarrier required to be disabled on each line in the line set, to obtain the subcarrier set, required to be disabled, of the multiple lines; wherein the calculating, according to the line crosstalk channel information corresponding to each subcarrier, a line set required to be disabled and corresponding to each subcarrier comprises: estimating a power gain factor according to the line crosstalk channel information corresponding to each subcarrier, and adding a line that makes the estimated power gain factor greater than a threshold to the line set required to be disabled and corresponding to each subcarrier. obtaining a disabled subcarrier set of the multiple lines according to line crosstalk channel information corresponding to each subcarrier of the multiple subcarriers, wherein the disabled subcarrier set comprises a subcarrier set required to be disabled on the multiple lines; and sending the disabled subcarrier set of the multiple lines to a transceiver, wherein the transceiver disables a transmit signal on a subcarrier required to be disabled on each line; wherein the obtaining a disabled subcarrier set of the multiple lines comprises: calculating, according to the line crosstalk channel information corresponding to each subcarrier, a line set required to be disabled and corresponding to each subcarrier; and searching, according to the calculated line set corresponding to each subcarrier, for a subcarrier required to be disabled on each line in the line set, to obtain the subcarrier set, required to be disabled, of the multiple lines; wherein the calculating, according to the line crosstalk channel information corresponding to each subcarrier, a line set required to be disabled and corresponding to each subcarrier comprises: estimating a power gain factor according to the line crosstalk channel information corresponding to each subcarrier, and adding a line that makes the estimated power gain factor greater than a threshold to the line set required to be disabled and corresponding to each subcarrier. calculating, according to the line crosstalk channel information corresponding to each subcarrier, a line set required to be disabled and corresponding to each subcarrier; and searching, according to the calculated line set corresponding to each subcarrier, for a subcarrier required to be disabled on each line in the line set, to obtain the subcarrier set, required to be disabled, of the multiple lines; wherein the calculating, according to the line crosstalk channel information corresponding to each subcarrier, a line set required to be disabled and corresponding to each subcarrier comprises: estimating a power gain factor according to the line crosstalk channel information corresponding to each subcarrier, and adding a line that makes the estimated power gain factor greater than a threshold to the line set required to be disabled and corresponding to each subcarrier. estimating a power gain factor according to the line crosstalk channel information corresponding to each subcarrier, and adding a line that makes the estimated power gain factor greater than a threshold to the line set required to be disabled and corresponding to each subcarrier.