The floating profit and loss of the day is calculated according to the settlement price. The floating profit of your last example is: (1418-17) * 100 =100 (of course, it will be less than100 due to the handling fee). Yesterday's floating profit can no longer be calculated, and it will be recalculated according to the current price and your entry price. Your actual profit is (1421-1417) *100 = 400 yuan.