You should understand the daily debt-free settlement rules in futures. The so-called debt-free settlement rule is actually to settle funds according to the daily settlement price of futures, so that the profit-making party of futures can get the corresponding profit space on the book of the day, and the loss space of futures flows out on the book of the day. You must pay attention to the futures and margin system. When you lose money, the corresponding margin will be insufficient because of the loss margin. When the maintenance margin is insufficient, you will receive a notice of additional margin payment. If you don't add it, you will be forced to close the position first to ensure that the futures contract will not be maliciously breached when it expires.

In fact, the opening price of bulls is different from that of bears. However, due to the existence of the daily debt-free settlement rule, no matter whether the bulls or bears gain or lose, the transaction price of the two futures contracts at maturity has long been unified into the daily settlement price of futures by this settlement rule. Therefore, there is no technical problem that it is difficult to realize spot settlement when both futures parties cash out.