Traditional linear method is, in our opinion, not satisfactory in solving the stochastic response and bifurcation of the intrinsically nonlinear muscular blood vessel system. So we propose nonlinear method and equivalent method of nonlinear differential equation Section 1 of the paper briefs the characteristics and analysis method of the nonlinear system. Section 2 explains in detail the mathematical model of equivalent method. And then stochastic response is discussed in section 3 based on the model mentioned above. The simulation given in figure 1 through 2 shows preliminarily that: the nonlinear model of the system was bui approximate analysis solution to the system's response was achieved; and the unstable P behaviors of the system were researched by numerical simulating. So It is significant to study stochastic response and forecast the potential coming forth phenomenon in this system under stochastic disturbance.
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