Abstract: In this paper, the present situation of wind farm steady-state equivalent modeling and dynamic equivalent modeling at home and abroad is briefly introduced. The researches on the modeling of wind speed-power output characteristics for wind farm are summarized firstly. Then the research on steady-state equivalent modeling of wind farm modeling is discussed from two aspects, the steady-state modeling of wind farms with different types of wind turbines and the power flow calculation of power system with wind farms. In addition, such aspects as the lumped parameter modeling method and the homology equivalent modeling method of dynamic equivalence of wind farm, and the equivalent simplification of the collection system within the wind farm, are briefly analyzed. In other hand, the polymerization methods of wind farm cluster parameters are concluded from such aspects as the weighted sum method, the aggregation method in the frequency domain and the polymerization method in the time domain. In the end, the prospect of the research trends of equivalent modeling for wind farm is envisioned.