The invention discloses a capacity allocation method of distributed generation and energy storage. The configuration method comprises the following steps of: setting the configuration objectives of distributed generation and energy storage units in the micro-grid as follows: the peak-valley difference of tie line power in the micro-grid is reduced below the target value respectively; Taking the economic evaluation standard as the objective function, under the condition of satisfying the configuration objective and load demand, the comprehensive cost of the primary equipment investment, installation and maintenance of the system is minimized. Partition constraints; Acquisition of grid data within the microgrid; Optimally configuring the grid data according to the constraint conditions. Distributed generation and energy storage can optimize and complement each other economically, postpone the upgrading and reconstruction of transmission and distribution equipment, improve the utilizationrate of power equipment, reduce the cost of grid reliability and promote the utilization of new energy.