A fast preference algorithm for stochastic resonance(SR) systems based on a Runge-Kutta algorithm which was applied in line-spectrum detection was put forward.The model of the bi-stable SR system was first unitary.Then the algorithm which calculated parameters according to the step chosen by an input SNR,the unitary frequency,and the amplitude estimated by a harmonic wave were given.This algorithm could be used to choose parameters while dealing with high frequency and large scale signals out of the adiabat...