Research on Supplier Chooses of Supply Chain Based on Grey System

The paper performs research to select the optimal supplier of construction supply chain. Firstly, this paper introduces the concept of the construction and Gray system theory. Secondly, it establishes the selection Model on supplier of the chain by the Gray correlation to select the optimal supplier, when evaluating supplier by the model. In addition, the paper uses the Entroy method to determine the weight of evaluation index to avoid the subjective interference of evaluators. Thirdly, the paper calculates the correlation between supplier vector and the best reference vector G/the worst reference vector B and the optimal subordinate degree. Finally, the empirical analysis proves that the evaluation method has practical effect as well as the theoretical significance.