Futures is the future price, and spot is the current price. The price now is definitely different from that in a few months. The trend of general futures and spot is the same. If the futures index deviates from the spot, there will be hedge funds to arbitrage until the deviation is within the range recognized by the market. It is precisely because the futures market has the function of self-regulation, so the big deviation of the futures market rarely occurs, and the slight deviation will be corrected immediately by arbitrage funds.