The profit and loss of stock index futures is based on the difference of points in the contracts you buy and sell (which can also be understood as contracts). For example, if you buy IF 1006, it means the difference between the points when you buy IF 1006 and the points when you sell IF 1006. Because futures are delivered at some time in the future, not immediately, for example, IF 1006 refers to our current expectation of the stock index in June, so it is different from the actual Shanghai and Shenzhen stock indexes. If the economy is expected to improve in the future, then the stock index futures in June will certainly be high. If everyone is depressed and thinks that the economy in June is worse than now, then the stock index will be low; Of course, the actual futures are generally higher than the actual index because there are other costs.

As the delivery date approaches, stock index futures will approach the actual index, which is why the recent futures contract price is closest to the Shanghai and Shenzhen index.