The selling of U.S. debt is mainly carried out through international financial securities trading institutions, such as the New York Stock Exchange and the American Stock Exchange.

China and the United States have had a long-term trade surplus. After China exported cheap goods to the United States, it received a large amount of colorful U.S. dollars, but was unable to purchase advanced American technology, high-end equipment and goods.

In desperation, the only option is to buy U.S. bonds and import large amounts of U.S. soybeans, corn and other agricultural products.