Stock index futures can be short. Futures can be bought first and then sold, or sold first and then bought.

When you think that the futures price of the Shanghai and Shenzhen 300 Index will fall, you can sell it first, and then buy and close the position after the market falls, so as to hedge your selling position and earn the difference. The specific transaction process is as follows:

Market outlook is bullish (buy up) = buy and open positions-sell and close positions.

Market outlook bearish (buy down) = sell and open positions-buy and close positions.

If you are not clear, you can communicate with me.