Considering the problem that efficiency of wind generation is generally low,a hierarchical distribution strategy of reactive power for DFIG wind farm is put forward to reduce the power loss of both wind turbine and wind farm.To improve the efficiency of wind generation,,the new strategy considers the stator and gird-side converters'power limitation based on the traditional reactive power distribution strategy and realizes the optimal distribution with the aim of least power loss.A simulation model of DFIG wind farm is built on MATLAB/Simulink platform.The results prove that the strategy can greatly reduce the power loss of wind turbine,improve the efficiency of wind generation and suppress voltage fluctuation caused by load changes,improving power quality.