A method for power adjustment based on low-delay power detection before Digital Pre-Distortion, DPD, wherein a baseband carrier data source outputs baseband carrier data to a Digital Up Conversion, DUC, module, the DUC module performs DUC on the baseband carrier data and outputs a signal after the DUC to a digital Crest Factor Reduction, CFR, module, the digital CFR module performs digital CFR on the signal after the DUC and outputs a signal after the digital CFR to a DPD module, and the DPD module performs the DPD according to the signal after the digital CFR and an adjusted power value, and outputs a signal after the DPD to a Power Amplifier, characterized in that the method comprises steps of: obtaining, by an apparatus for power adjustment based on low-delay power detection before the DPD according to preconfigured system carrier information, effective carrier information including an effective carrier channel corresponding to an effective carrier, wherein the effective carrier is a carrier bearing information; sampling, by the apparatus from the baseband carrier data according to the obtained effective carrier information, carrier data on an effective carrier channel, and then determining, according to sampled carrier data on effective carrier channels, total power Pa of effective carriers before the DUC; and performing, by the apparatus before the DPD, power adjustment using the total power Pa of the effective carriers by: searching a power compensating search table made beforehand for a compensating entry Ga corresponding to the total power Pa of the effective carriers; determining, according to the found compensating entry Ga, the adjusted power value; and outputting the adjusted power value to the DPD module, wherein the sampling, by the apparatus from the baseband carrier data according to the obtained effective carrier information, carrier data on an effective carrier channel comprises: selecting, by the apparatus, data sample points corresponding to a carrier data rate used; and sampling, by the apparatus from the baseband carrier data at the data sample points, carrier data before the DUC on the effective carrier channel. obtaining, by an apparatus for power adjustment based on low-delay power detection before the DPD according to preconfigured system carrier information, effective carrier information including an effective carrier channel corresponding to an effective carrier, wherein the effective carrier is a carrier bearing information; sampling, by the apparatus from the baseband carrier data according to the obtained effective carrier information, carrier data on an effective carrier channel, and then determining, according to sampled carrier data on effective carrier channels, total power Pa of effective carriers before the DUC; and performing, by the apparatus before the DPD, power adjustment using the total power Pa of the effective carriers by: searching a power compensating search table made beforehand for a compensating entry Ga corresponding to the total power Pa of the effective carriers; determining, according to the found compensating entry Ga, the adjusted power value; and outputting the adjusted power value to the DPD module, wherein the sampling, by the apparatus from the baseband carrier data according to the obtained effective carrier information, carrier data on an effective carrier channel comprises: selecting, by the apparatus, data sample points corresponding to a carrier data rate used; and sampling, by the apparatus from the baseband carrier data at the data sample points, carrier data before the DUC on the effective carrier channel. selecting, by the apparatus, data sample points corresponding to a carrier data rate used; and sampling, by the apparatus from the baseband carrier data at the data sample points, carrier data before the DUC on the effective carrier channel.