It’s a new challenge to power system stability with large wind farm’s integration. Taking the wind farm which consist of GE1.5MW double fed induction generators that has been modeled in the software PSS/E as the research object, The difference between the impact of wind farm and conventional generators integrated to grid in power system transient progress is analyzed. Besides, the impact on transient progress of increasing wind farm penetration and differnet interconnection with wind farm to power system is investigated.