On the Jinrong China platform, the overnight interest rate is charged differently according to the different directions of opening a position by the customer: the overnight interest rate for orders to buy and open a position is 1.25%, and the overnight interest rate for orders to open a sell and open a position is 1.25%. 0.75%. The specific calculation formula is: closing price of the day × contract unit × lot size × interest rate × (1/360). In this way, investors can determine the overnight holding fee they have to pay based on their own trading conditions, which is conducive to scientific control of investment costs.