When government bond index rises, the debt base will generally rise; On the contrary, when government bond index falls, the debt base will generally retreat. Government bond index: All the fixed-rate government bonds listed on the exchange are sampled and weighted according to the issuance of government bonds. The purpose is to reflect the overall changes in the bond market, which is an "indicator" of the price changes in the bond market. Bond fund: also known as bond fund, refers to a fund that specializes in investing in bonds. By pooling the funds of many investors, it makes a portfolio investment in bonds and seeks a relatively stable return.