The invention provides an amending method and an amending system directing at an unbalanced zero intermediate frequency feedback, and the amending method and the amending system are used for solving the problems of unobvious effect of the existing amending method and inexact I/Q signal. The method comprises the following steps: sampling a zero intermediate frequency feedback signal, wherein the zero intermediate frequency feedback signal comprises an I signal and a Q signal; respectively counting direct current leakage volumes of the I signal and the Q signal, and performing the direct current amending treatment on the I signal and the Q signal according to the direct current leakage volumes; counting an amplitude ratio of the I signal and the Q signal after the direct current amendment, and performing amplitude amending treatment on the I signal and the Q signal after performing the direct current amendment according to the amplitude ratio; counting a phase position difference between the I signal and the Q signal after amending the phase position, and performing phase position amending treatment on the I signal and the Q signal after performing the amplitude amendment according to the phase position difference; and performing digital distortion factor updating treatment on the I signal and the Q signal after performing the I signal and the Q signal to obtain the I signal and the Q signal to be sent. With the adoption of the amending method and the amending system, the obtained I signal and the Q signal to be sent are more exact.