The contract value of stock index futures is very high, and the primary market value is about one million yuan. If it is operated, it is recommended not to trade in Man Cang. It will be much more comfortable to use a 30% position, because the stock index futures itself is a leveraged transaction, which magnifies the transaction and the efficiency of the use of funds is absolutely guaranteed. If the margin is insufficient, the futures company will call the customer as soon as possible, which is not necessary. General futures companies will not take leveling measures. In addition, the trading hours of stock index futures are from 9: 00 am 15 to1:30, and from 13:00 to15 in the afternoon. No trading at other times.