A transmit power control method, wherein the method comprises: acquiring, by a sending apparatus, first information that is used to adjust transmit power for sending a first signal, wherein the first signal is composed of multiple working channels; acquiring, by the sending apparatus, power of each working channel; and determining, by the sending apparatus, a to-be-adjusted working channel according to an adjustment step, the first information, and the power of each working channel, so as to adjust the transmit power for sending the first signal; wherein if the first information requests to increase the transmit power, enabling, by the sending apparatus, the to-be-adjusted working channel; and if the first information requests to reduce the transmit power, disabling, by the sending apparatus, the to-be-adjusted working channel; characterized in that the method further comprises: acquiring phase shifts of the multiple working channels before the adjustment, and phase shifts of the multiple working channels after the adjustment; and if the phase shifts of the multiple working channels after the adjustment are different from the phase shifts of the multiple working channels before the adjustment, adjusting the phase shifts of the multiple working channels after the adjustment, so that the phase shifts of the multiple working channels after the adjustment are the same as the phase shifts of the multiple working channels before the adjustment. acquiring, by a sending apparatus, first information that is used to adjust transmit power for sending a first signal, wherein the first signal is composed of multiple working channels; acquiring, by the sending apparatus, power of each working channel; and determining, by the sending apparatus, a to-be-adjusted working channel according to an adjustment step, the first information, and the power of each working channel, so as to adjust the transmit power for sending the first signal; wherein if the first information requests to increase the transmit power, enabling, by the sending apparatus, the to-be-adjusted working channel; and if the first information requests to reduce the transmit power, disabling, by the sending apparatus, the to-be-adjusted working channel; characterized in that the method further comprises: acquiring phase shifts of the multiple working channels before the adjustment, and phase shifts of the multiple working channels after the adjustment; and if the phase shifts of the multiple working channels after the adjustment are different from the phase shifts of the multiple working channels before the adjustment, adjusting the phase shifts of the multiple working channels after the adjustment, so that the phase shifts of the multiple working channels after the adjustment are the same as the phase shifts of the multiple working channels before the adjustment. acquiring phase shifts of the multiple working channels before the adjustment, and phase shifts of the multiple working channels after the adjustment; and if the phase shifts of the multiple working channels after the adjustment are different from the phase shifts of the multiple working channels before the adjustment, adjusting the phase shifts of the multiple working channels after the adjustment, so that the phase shifts of the multiple working channels after the adjustment are the same as the phase shifts of the multiple working channels before the adjustment.