The invention discloses an approximate minimum bit error rate (BER) power distribution method for a hybrid carrier system, relating to an approximate minimum BER power distribution technology for the hybrid carrier system, and aiming to improve the BER performance of the hybrid carrier system and increasing the achievable rate of the system. The method comprises the following steps: at a transmitting terminal, performing alpha-order weighted fractional Fourier transform for data on each band to obtain the data in a frequency domain; in the frequency domain, performing power distribution operations for the data obtained in step 1, performing IFFT for the distributed data, transforming the data to a time domain, and sending the data to a channel; at a receiving terminal, performing FFT for the received data, and transforming the data back to the frequency domain; performing channel equalization in the frequency domain; after equalization, performing inverse operations of power distribution in the frequency domain; and performing -alpha-order fractional Fourier transform demodulation, and outputting the data. The approximate minimum BER power distribution method disclosed by the invention is suitable for powder distribution occasions in wireless communication.