The so-called futures generally refers to futures contracts, which are standardized contracts made by futures exchanges and agreed to deliver a certain number of subject matter at a specific time and place in the future. This subject matter, also known as the underlying asset, can be a commodity, such as copper or crude oil, a financial instrument, such as foreign exchange and bonds, or a financial indicator, such as three-month interbank offered rate or stock index. (that is, bonds are a kind of futures) At the same time, Eurobonds are a kind of foreign exchange futures, which depend on the exchange rate, and naturally know whether they are valuable after maturity.