Abstract: Nonlinearities are often encountered in the analysis and processing of real signals.The method often used is transforming the signal from nonlinear signal to linear signal by transiting it through a processing system.In this paper,a nonlinear signal processor's design framework and implementing means are given.Its fundamental is letting the signal being processed by a nonlinear filter,and according to mathematics we can prove that the signal after filtering is linear.Moreover,different transform basis and filters can be selected depending on different kinds of signal.