In view of the present situation and problems existing in Chinas wind power operation， as well as the status quo of wind farms active power control， a control strategy is proposed for large cluster of wind farms active power intelligent control system. The overall concepts and framework， the control models and exceptional conditions handling strategy are introduced. The two coordination control methods， i.e. the maximum output control method and the output tracking control method are designed for the wind farms. Results of applying the strategy proposed to the actual operation in Gansu power grid prove its feasibility.