Stock index futures are high-risk investment products, and many investors may encounter the situation of paying margin. First of all, the price of stock index futures fluctuates greatly, so in order to protect the interests of themselves and customers, futures companies will ask customers to pay the deposit when the account margin is insufficient. This also ensures that the account can get enough funds to pay any losses in the shortest time.

Secondly, with the advancement of trading time, the price of stock index futures changes greatly, so it is necessary to adjust the margin balance simultaneously to avoid account liabilities. Paying the deposit in advance can reduce the risk of account loss and help customers' trading confidence and action.

Finally, paying margin is a requirement that must be accepted when signing stock index futures contracts. When trading, buyers and sellers must abide by the relevant regulations formulated by the exchange, and any operation that violates the regulations may have serious consequences, including forced rehabilitation and debt recovery. Therefore, when trading stock index futures, we must clearly understand the relevant regulations and strictly abide by them in operation in order to obtain better returns in the investment process.