In order to achieve the efficient consumption and utilization of distributed generation of high penetration, an optimal placement method of distributed generations considering power export in multi-voltage level grid is proposed. In this paper, the temporal characteristics of different types of DGs and load are analyzed firstly, then the dual network coupling model as well as the method of power export is proposed. On this basis, the multi-objective model of DG optimal allocation based on the typical scenarios analysis is established. Finally, the practicability and effectiveness of the proposed method are validated via the IEEE 33-bus test system and IEEE30-bus test system. And the result shows that the proposed method can effectively improve the economy of the system and the consumption of distributed generation. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900100).