According to the regulations of China Financial Futures Exchange, stock index futures contracts are only traded for four months at a time, namely, the current month, the next month, the end of the first quarter and the end of the second quarter.

Because the stock index futures were first launched in April 16, and no contract was arranged in April, there were only four months: May (including the current month's contract), June (next month), September (the first quarter-end month) and 65438+February (the second quarter-end month).

After the contract was delivered in May, the contract was launched in July, so that the transactions were carried out in June, July, September and 12 at the same time. ......