The stability of wind turbine is directly related to its overall performance, safety and lifetime, so it must be considered in the plant design. In our experiment, segmented linearization of the wind turbine is conducted by modulus linearization of GH Bladed software, on the basis of which a nonlinear simulation model of wind turbine control system is established in MATLAB/SIMULINK enviroment. Step response, root locus, Bode diagram and Nyquist curve are used in stability analysis of the open-loop controlsystem and closed-loop control system in disturbed and undisturbed enviroments. All analytical results show that the 2 MW control system is stable. It's necessary to analyze the stability for the control system of wind turbine, which can provide a theoretical basis for the design of wind turbine ralating to such issues as security, reliability and robustness.