National funds are investment funds whose funds are mainly invested in specific countries or regions. It is usually a company investment trust fund with a specific repayment period. By issuing beneficiary certificates overseas, the State Fund will hand over the funds raised from overseas to designated investment institutions for centralized investment in stocks and bonds of specific countries, and distribute the proceeds to investors as reinvestment or dividends. This kind of fund beneficiary certificate is generally listed in new york, London and other stock exchanges. Some countries that do not allow foreign capital to enter or implement foreign exchange control in principle can use state funds to raise foreign capital. In addition, the national fund can obtain tax relief and special preferential policies in some areas.