Abstract: Based on the stnding relationship of storage-release and the physis property of linear and nonlinear Kernel function, We Yealize that the relationship between linear and nonlinear Kernel function exists inherent physic relation of thing. If we catch at this objective law. weuse the linear kernel to express nonlinear kernel, it is too convenience calculating for us. This paper not only describes the physic property and trausfered relation, but also proposes four models of nonlinear kernel function which include time Variance and time invariance. Therefore, prospect of linear kernel researching is Opened.