Abstract: An evaluation index system based on technology, economy and development scale index is constructed for the grid-connection mode selection of local power grid with DC sending energy base system. Considering the influence of subjective and objective factors, a grid mode optimization method based on multiple attribute decision-making is proposed. First of all, an evaluation index system is established based on the summary of the problems of isolated-connected and gird-connected modes. Furthermore, the analytic hierarchy process based on subjective weight and the entropy weight method based on objective weight are adopted to select the combination weight. And the optimization method based on multiple attribute decision-making is proposed. By calculating the relative closeness of different alternatives, the optimal decision of grid-connection mode can be realized. Finally, an actual DC project is taken as an example to verify the rationality of the proposed method.