The trend of stock index futures is consistent with the trend of the underlying stock index and influenced by the trend of stock index constituent stocks, but it will not be the opposite anyway. Maybe you were influenced by "taking an opposite position in the futures market" when hedging, and you didn't understand it thoroughly. The main purpose of stock index futures is indeed hedging, which can be hedged because its change is consistent with the spot stock index. Here, maintaining spot value not only refers to stop loss, but also includes profit, that is, fixed spot price.