According to the present serious phenomenon of series capacitor compensation inducing Subsynchronous Oscillations, this paper was proposed to use TCR SVC to suppress the subsynchronous oscillations. Based on researching on the subsynchronous oscillations and SVC theories, this paper used MATLAB/SIMULINK to establish TCR SVC models. The models and the effectiveness were tested by the IEEE first standard model of researching subsynchronous oscillations. MATLAB was used to do domain simulation of this model which was with and without SVC. Comparing the different types of SVC’s features on suppressing the subsynchronous oscillations. And this paper improves the SVC based on the comparison. The conclusion can be got that the improved SVC get a better effect on suppressing the subsynchronous oscillations.