In order to analyze the effect of wind power integration on low frequency oscillation of synchronous machine main system, the small-signal analysis models of FSIG and DFIG are built firstly, then the damping change mechanism after the above two generators integration is revealed by using the singularly perturbed system reduction. The influence of FSIG and DFIG integration with different parameters on system oscillation modes and damping is analyzed combined with the singularly perturbed system reduction and eigenvalue analysis. The IEEE testing system simulation shows that the proposed scheme can analyze the system low-frequency oscillation after wind power integration intuitively and effectively.