Short selling means that investors who originally held short selling rights bought back their own stocks and chose not to short. When the market began to change to a bullish trend, bears began to choose to leave.

A futures index is a futures index. The varieties of stock index futures have the following characteristics: the subject matter of stock index futures is the corresponding stock index. The quotation unit of stock index futures is the index point, and the value of the contract is expressed by the product of a certain currency multiplier and the stock index quotation. The delivery of stock index futures adopts cash delivery, that is, the position is settled in cash instead of stock delivery.