First, gold has economic security. The physical and chemical characteristics of gold ensure that it will never deteriorate, which is the only asset that can ensure the consistency of foreign exchange reserves. Second, gold can meet unexpected demand. Although the possibility is very low, people may encounter some destructive things, such as war or high inflation, which will have a serious impact on sovereign bonds or lead to national division. As a globally recognized final payment method, gold is a very important guarantee mechanism. At the same time, it can also be applied to international mortgage activities. Third, gold can bring people confidence. Although gold has withdrawn from the era of supporting currency circulation, it can still add confidence to the currency internationally. Finally, gold can spread risks. In this regard, the central bank is more concerned than other types of investors. Many studies show that the inclusion of gold in the investment portfolio can greatly reduce the volatility of central bank assets.