I. Steps for Bank of Communications to purchase government bonds through online banking:

1. Open the business of buying government bonds by banks. After opening online banking, you can operate online.

2. Log in to online banking and enter the column of "Treasury bonds, securities and futures". In the savings bonds (electronic) drop-down item, click "Open an account in escrow account".

3. The mobile phone can be set to receive the dynamic password when it is turned on.

4. After logging into the online banking of Bank of Communications, click the second item "savings bonds (Electronic)" in "Treasury futures", and there are only two treasury bonds codes (3-year and 5-year) in "Treasury bonds subscription".

5, according to the prompt to buy.

Second, the relevant contents of the national debt

1. national debt (national debt; Governmentloan, also known as national bond, is a creditor-debtor relationship formed by the state on the basis of its credit and in accordance with the general principles of debt. National debt is issued by the state, which is a kind of government bond issued by the central government to raise financial funds. It is a debt certificate issued by the central government to investors, promising to pay interest and repay the principal at maturity within a certain period of time. Because the issuer of national debt is the country, it has the highest credit and is recognized as the safest investment tool. According to the different ways of borrowing debts, national debt can be divided into national bonds and national loans. According to the different repayment periods, national debt can be divided into fixed-term national debt and irregular national debt.

2. Because the issuer of national debt is the country, it has the highest credit and is recognized as the safest investment tool. It is the main form of national credit. The central government often issues treasury bonds to make up for the national fiscal deficit, or to raise funds for some costly construction projects, some special economic policies and even wars. Because the national debt takes the tax revenue of the central government as the guarantee to repay the principal and interest, it has low risk, strong liquidity and lower interest rate than other bonds. China's national debt refers to the national debt issued by the Ministry of Finance on behalf of the central government. Guaranteed by the national financial reputation, the credibility is very high. It has always been called "Phnom Penh bond", and cautious investors like to invest in government bonds. There are three kinds of bonds: voucher bonds, physical bonds and book-entry bonds.