Abstract: Due to the increasing installed capacity of wind farm,traditional centralized control and communication mode cannot meet the requirements of operation reliability and compatibility. Therefore,a wind farm control framework based on multi-agent is designed,with a novel reactive power control strategy for collector line loss reduction. Meanwhile,a hybrid multi-agent simulation platform based on Java/JADE+MySQL+Matlab/Simulink is developed,on which a 125 MW wind farm is modeled and simulated. The study results verify the effectiveness of the strategy proposed.