A bond is a debt instrument issued by a corporate or government (“bond issuer”) which aims at borrowing money to raise fund. Since the bond issuer promises to pay interest and principal on defined dates, investors always take it as an opportunity to obtain stable return. However, as different bond issuers have different repayment abilities, investors should pay attention to the respective credit risk before investing. In the past, there were few channels of direct bond investments for individual investors and the investment amounts involved were relatively high. Along with the evolution of the financial market, more channels for direct bond investment are now available and the investment thresholds have also lowered in recent years, making it an increasingly popular investment tool.