Refers to the margin requirements of futures contracts and the trading rules of exchanges. The financial strength of futures varieties usually refers to the margin requirements of futures contracts and the trading rules of exchanges. Margin is a certain proportion of funds that traders need to pay to ensure that traders fulfill their obligations in the contract. Different exchanges and futures contracts also have different trading rules, such as minimum trading unit, minimum trading margin, trading restrictions, and strong leveling mechanism, which are closely related to the financial strength of futures varieties.