As a new modern business model, the unique advantage was proposed for supply chain finance in proposing in small and medium enterprises and competitiveness making of industry chain. But in the risk assessment the unified perfect evaluation， standard is still lack. The finance model of supply chain is first given in this paper , through the analysis of the risk factors, the system risk evaluation system is established in fuzzy comprehensive evaluation. Through the analysis of an enterprise in non-ferrous metal pledge financing reservoir, the risk of each enterprise is quantified in the supply chain. And then the risk control platform is set up, including the finance institution, logistics enterprises and financing enterprises.