The invention discloses a primary frequency modulation feedback channel nonlinear link parameter configuration method and system, and aims at a primary frequency modulation model containing a dead zone-PID controller-amplitude limiting link; the configuration method comprises the following steps: representing a nonlinear link through a description function; determining a nonlinear link gain; and according to the improved Nyquist criterion, determining the stability range of specific parameters of a single nonlinear link and the dead zone-PID controller-amplitude limiting link. According to theinvention, a reference scheme is provided for primary frequency modulation dead zone amplitude limiting link parameter setting in practical application; meanwhile, according to the improved Nyquist criterion, a curve is used for replacing an original single feature point, and compared with a traditional Nyquist criterion, the influence of the internal structure of the nonlinear link on system stability can be better reflected.