Data are mainly collected from the background through foreign exchange business systems such as Jinhong System (i.e. balance of payments declaration system) and direct investment information management system (FDI). The foreign exchange bureau will compare the collected data with other regulatory data such as enterprise declaration data and tax payment data of the tax bureau, and analyze the relationship between them, so as to judge whether the foreign exchange revenue and expenditure of the enterprise are consistent with the business development, and accordingly judge whether the enterprise is operating legally and legally.