To study the impacts of penetration rate and integration methods of DFIG-based （doubly fed induction generator） wind farm on system stability, firstly, the dynamic model of doubly-fed induction generator was described by the differential algebraic equations, and the coefficient matrix of total system was derived. Then, the eigenvalue and participation factors of wind farm system were calculated according to the small signal analysis theory, and the dominant oscillation modes of system were determined. Finally, taking augmented IEEE 3-generator and 9-bus test system as example, the damping changes of electromechanical oscillation modes were analyzed under different penetration rates and various integration methods. The research results show that, the increasing of penetration rate of wind generation has a detrimental impact on the power angle stabilities of the adjacent synchronous machines when their capacities are reduced at the meantime and the system is without compensation. The stabilities of systems voltage and power angle are improved greatly with the increasing of SVC （static var compensator） compensation capacity, under same penetration rate. The improving effect of the SVC compensation on the system stability will decrease with the increase of penetration rate. It follows that the penetration rate and integration methods of DFIG-based wind farm have great influences on the system stability.