A method for controlling power of a carrier signal, comprising: determining, by the user equipment, that a sum of the power of the at least two carrier signals is greater than a maximum transmit power supported by the user equipment; receiving, by user equipment, power control parameters, from at least one base station, of at least two carrier signals, wherein the at least two carrier signals are signals sent on at least two aggregation carriers; determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals, wherein a channel gain reference quantity represents a magnitude of a channel gain; and controlling, by the user equipment, power of the at least two carrier signals according to the channel gain reference quantities; characterized in that the channel gain reference quantities corresponding to the at least two carrier signals comprise a first channel gain reference quantity corresponding to the first carrier signal and a second channel gain reference quantity corresponding to the second carrier signal; the power control parameters comprise I_psd_1, G1, I_psd_2, and G2, wherein G1 is a first path loss from the user equipment to the base station, I_psd_1 is an interference power spectrum of the user equipment on a first carrier frequency, G2 is a second path loss from the user equipment to the base station, and I_ysd_2 is an interference power spectrum of the user equipment on a second carrier frequency; and the determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals comprises: determining, by the user equipment, the first channel gain reference quantity according to the following formula: α 1 = G 1 / I _ p s d _ 1 * γ 1 wherein α1 is the first channel gain reference quantity, and γ1 is a first bit error ratio that meets transmission of the first carrier signal; and determining, by the user equipment, the second channel gain reference quantity according to the following formula: α 2 = G 2 / I _ p s d _ 2 * γ 2 wherein α2 is the second channel gain reference quantity, and γ2 is a second bit error ratio that meets transmission of the second carrier signal. determining, by the user equipment, that a sum of the power of the at least two carrier signals is greater than a maximum transmit power supported by the user equipment; receiving, by user equipment, power control parameters, from at least one base station, of at least two carrier signals, wherein the at least two carrier signals are signals sent on at least two aggregation carriers; determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals, wherein a channel gain reference quantity represents a magnitude of a channel gain; and controlling, by the user equipment, power of the at least two carrier signals according to the channel gain reference quantities; characterized in that the channel gain reference quantities corresponding to the at least two carrier signals comprise a first channel gain reference quantity corresponding to the first carrier signal and a second channel gain reference quantity corresponding to the second carrier signal; the power control parameters comprise I_psd_1, G1, I_psd_2, and G2, wherein G1 is a first path loss from the user equipment to the base station, I_psd_1 is an interference power spectrum of the user equipment on a first carrier frequency, G2 is a second path loss from the user equipment to the base station, and I_ysd_2 is an interference power spectrum of the user equipment on a second carrier frequency; and the determining, by the user equipment according to the power control parameters, channel gain reference quantities corresponding to the at least two carrier signals comprises: determining, by the user equipment, the first channel gain reference quantity according to the following formula: α 1 = G 1 / I _ p s d _ 1 * γ 1 wherein α1 is the first channel gain reference quantity, and γ1 is a first bit error ratio that meets transmission of the first carrier signal; and determining, by the user equipment, the second channel gain reference quantity according to the following formula: α 2 = G 2 / I _ p s d _ 2 * γ 2 wherein α2 is the second channel gain reference quantity, and γ2 is a second bit error ratio that meets transmission of the second carrier signal. determining, by the user equipment, the first channel gain reference quantity according to the following formula: α 1 = G 1 / I _ p s d _ 1 * γ 1 wherein α1 is the first channel gain reference quantity, and γ1 is a first bit error ratio that meets transmission of the first carrier signal; and determining, by the user equipment, the second channel gain reference quantity according to the following formula: α 2 = G 2 / I _ p s d _ 2 * γ 2 wherein α2 is the second channel gain reference quantity, and γ2 is a second bit error ratio that meets transmission of the second carrier signal.