For example, if the stock index or commodity price of the futures target rises, the futures price will usually rise. In this case, if you hold a long futures position, it will inevitably lead to a floating profit of the position. According to the daily mark-to-market settlement system and T+0 trading system, you can use this floating profit to buy futures contracts and increase long positions, instead of buying more stocks with the profits after selling stocks like domestic A-shares. Above or below the average interest rate here should mean that you use your futures position profit to increase your position without taking other measures to obtain funds at a certain cost to increase your position.