With the urgent need for energy conservation and intrinsic intermittence optimization, seawater pumped hydro energy storage (SPHS) is developing rapidly in the foreign countries but no one has been built in China. Nevertheless, with vast resources, our country pays much attention on SPHS site selection lately since its superiority and the need for long-term energy development. To select the most ideal SPHS site from numerous candidate alternatives, 18 evaluation criteria are set in this paper. Due to vague relevance among criteria, λ -fuzzy measure combining Analytic Hierarchy Process (AHP) and entropy weight method are proposed to determine criteria weights. Later, fuzzy Vlsekriterijumska Optimizacija I Kompromisno Resenje (VIKOR) method is applied to sort an optimal solution for the SPHS construction. Simultaneously, the published data from National Energy Administration (NEA) combining experts' scoring and public opinions are calculated as a case and the Fu Ying Island in Ning De is proved to be the best. In order to ensure the validity and stability of the result, comparative and sensitive analysis are proposed. Overall, the proposed model can provide a reference to the government and electricity grid for further evaluation since SPHS site selection has not been deeply studied in China.