A method for reducing transmit power, wherein the method comprises: Allocating, according to at least one type of information among quality of service QoS information of a user, historical scheduling information, and channel quality information, initial bandwidth to all terminals scheduled in a current timeslot in a cell; Calculating remaining bandwidth in the current timeslot according to the initial bandwidth of all the terminals scheduled in the current timeslot, and obtaining remaining system bandwidth according to the remaining bandwidth in the current timeslot, or after statistics processing is performed on the remaining bandwidth in the current timeslot and remaining bandwidth in a historical timeslot; characterized in that when the remaining system bandwidth is greater than preset threshold bandwidth, reducing transmit power based on a time domain or a frequency domain to calculate expanded bandwidth of each terminal scheduled in the current timeslot; calculating, according to the initial bandwidth and the expanded bandwidth of each terminal scheduled in the current timeslot and according to a linear fitting function and based on the time domain or the frequency domain, a transmit power reduction value corresponding to each terminal in a current scheduling timeslot after each terminal has undergone bandwidth expansion, and obtaining a time domain system power reduction value, or a final frequency domain system power reduction value of each terminal according to the transmit power reduction value in the current scheduling timeslot or according to a result of statistics processing performed on the transmit power reduction value in the current scheduling timeslot and a transmit power reduction value of a historical scheduling timeslot; and when the time domain system power reduction value is not less than a preset threshold, reducing transmit power of a base station based on the time domain; or when the final frequency domain system power reduction value of each terminal is not less than the preset threshold, reducing transmit power of a base station based on the frequency domain. Allocating, according to at least one type of information among quality of service QoS information of a user, historical scheduling information, and channel quality information, initial bandwidth to all terminals scheduled in a current timeslot in a cell; Calculating remaining bandwidth in the current timeslot according to the initial bandwidth of all the terminals scheduled in the current timeslot, and obtaining remaining system bandwidth according to the remaining bandwidth in the current timeslot, or after statistics processing is performed on the remaining bandwidth in the current timeslot and remaining bandwidth in a historical timeslot; characterized in that when the remaining system bandwidth is greater than preset threshold bandwidth, reducing transmit power based on a time domain or a frequency domain to calculate expanded bandwidth of each terminal scheduled in the current timeslot; calculating, according to the initial bandwidth and the expanded bandwidth of each terminal scheduled in the current timeslot and according to a linear fitting function and based on the time domain or the frequency domain, a transmit power reduction value corresponding to each terminal in a current scheduling timeslot after each terminal has undergone bandwidth expansion, and obtaining a time domain system power reduction value, or a final frequency domain system power reduction value of each terminal according to the transmit power reduction value in the current scheduling timeslot or according to a result of statistics processing performed on the transmit power reduction value in the current scheduling timeslot and a transmit power reduction value of a historical scheduling timeslot; and when the time domain system power reduction value is not less than a preset threshold, reducing transmit power of a base station based on the time domain; or when the final frequency domain system power reduction value of each terminal is not less than the preset threshold, reducing transmit power of a base station based on the frequency domain.