Increasing installed capacity of wind power has a more significant impact on the operation of power systems. Therefore, the influences of the wind power on the low-frequency oscillations of power systems have become an important issue concern. This paper sets up a complete three-machine nine-bus power system to research the influence of the doubly fed induction generator (DFIG) on the low-frequency oscillation in power system. The results show that the access of DFIG introduces a new mode of low-frequency oscillation. In addition, the damping characteristic of the oscillation mode vary from the DFIG’s increasing access capacity to different access position.