2. Buy US Treasury bonds directly from domestic brokers.
3. Open an account in Hong Kong and purchase US debt through online operation.
4. Participate in non-competitive bidding through TreasuryDirect, the official website of the US Treasury Department.
5. Invest through QDII, which is a system that allows domestic investors to invest in overseas markets, including buying US Treasury bonds and investing in other wealth management products of US Treasury bonds.