The following methods:

1. Public bidding method: The government publicly issues treasury bonds to the market through announcements, and investors purchase treasury bonds through bidding.

2. Underwriting method: The government signs an agreement with the underwriter, and the underwriter underwrites the treasury bonds and is responsible for selling the treasury bonds to investors. Underwriters are financial institutions and securities companies. This method quickly introduces government bonds to the market, and the underwriters assume the responsibility for selling them.

3. Direct sale method: The issuer sells government bonds directly to specific institutions instead of going through the open market. This method is often used for targeted sales to specific investors, such as pension insurance funds, unemployment insurance funds, financial institutions, etc.

4. "Buy as you go" method: Issuers bundle treasury bonds with other financial products, and investors choose to purchase treasury bonds incidentally when purchasing other financial products.