Each contract month has a corresponding delivery date, May is May 2 1, June is June 18, and July is July 16. . . . . . . . .

IF 1004 is a stock index futures contract that expires on April 20 10.

IF 1005 is a stock index futures contract that expires in May 20 10.

And so on. You can only trade for four months at a time, plus one month's contract after delivery. For example, now that the June contract has been delivered, the August contract has been increased. In the transaction, it is always "the current month, the next month and the last two quarters"

The Shanghai and Shenzhen 300 Index takes the adjusted share capital after the classification of free floating share capital as the weight. Grading technology

The adoption of technology ensures that the amount of share capital used for index calculation is relatively stable when the share capital of the sample company changes little.

In order to effectively reduce the tracking cost caused by frequent changes in equity. Replace the whole with the adjusted freely circulating share capital.

The Shanghai and Shenzhen 300 Index, with equity as its weight, can truly reflect the stock price changes of the actual circulating shares in the market.

Situation, so as to effectively avoid manipulating the index by manipulating large-cap stocks.