Abstract:While the development of science and technology have brought enormous material enjoyment to mankind, the contradiction between environmental resources and it has gradually erupted. In this context, Green Supply Chain Management (GSCM) has emerged. The key means to the implementation of GSCM is incorporating environmental factors into the actual scenarios of supplier selection. This study proposes an improved green supplier selection model based on interval-valued intuitionistic uncertain language sets (IVIULSs) and GRA-TOPSIS methods. Based on IVIULSs, the uncertain information encountered by decision makers in evaluating suppliers is processed. Then, use the GRA-TOPSIS method to prioritize alternatives and select the best suppliers. The model can more accurately deal with the uncertainty and ambiguity of on makers'' subjective evaluation, making the ranking of green suppliers more realistic and accurate. Finally, the paper applies the model to the agri-food industry and successfully verifies the feasibility and effectiveness of the proposed green supplier selection model.