At present, the intraday trading fee of stock index futures is 15 times of the overnight trading fee. For example, if it is 5200 points, then the cost of unilateral overnight opening or closing is 5200*300* 0.23=35.88 yuan. If the position is closed within one day, the closing fee is 35.88* 15=538.2 yuan. In this way, the high handling fee limits its activity.