Using the fuzzy optimization method, multi-objective optimization planning is used to obtain the optimization multi-solution scheme set of power grid planning, and the quantitative objective of the scheme and its eigenvalue matrix are calculated. For the qualitative criteria, an expert system based on planning knowledge and experience is established to obtain the qualitative objective fuzzy evaluation matrix of the scheme. For the two matrices of quantitative and qualitative objectives, the unified decision-making objectives are used to make the scheme optimization decision-making with relative superiority. When the decision-making optimal planning scheme is not satisfied, the weights and their membership functions between multiple objectives are corrected and adjusted, and the optimization planning scheme is recalculated until a satisfactory scheme is obtained. This method can not only consider the quantitative and qualitative factors, but also reflect the overall optimization performance of the system, and apply it to the planning decision support system, which can realize the decision-making function of power grid planning scheme with intelligent simulation.