One of the core for financial is risk control, and control risk by the big data technology is the trend. Different internet financial companies have their own advantages and disadvantages in their access to data and data types, but they have a common goal in risk control,it is reducing the cost of information. However, due to the limited amount of data of the enterprise itself, the risk assessment and risk control can not be well processed through the large data processing. Using the theory of the value and the cost of information and reputation model simplified on the feasibility and necessity of enterprise through the sharing of data to expand the amount of data, pointed out that the shared database helps reduce information asymmetry, reduce the risk of enterprises, contribute to the long-term development of the enterprise, also contributes to the Internet finance towards inclusive financial goals.