A new type of operating mode and control method of intermittent power plant is explored. Firstly， the feasibility of coordinated control of intermittent power plant cluster is analyzed based on the existing prediction and control technique. Secondly， the basic functions of cluster coordinated control are analyzed in three aspects， namely， active power control， reactive power control， and security and stability control. Thirdly， three basic principles of cluster coordinated control are proposed. Then based on the proposed principles， the general starting points of formulating control strategy are expounded roundly from three aspects， namely， time-scale， space-grain-size and function-decoupling. Fourthly， the overall functional structure of coordinated control platform of intermittent power plant cluster is designed. And then， a four-layered hierarchical and distributed control system including wind/photovoltaic unit， wind farm/photovoltaic station， group of wind farm/photovoltaic station and cluster is proposed. Finally， a prospect of supporting technique of coordinated control of intermittent power plant cluster is analyzed. And the vision of intermittent power plant cluster controlled as conventional power plant is pointed out.