The transaction cost of futures is mainly the handling fee. The handling fee of gold is charged unilaterally and settled on the same day, that is, the handling fee at the time of opening the position is charged at the time of closing the position. Closing fee rate = closing discount rate * transaction fee rate; Closing fee = closing discount rate * transaction fee. If the closing discount rate is 0, it means that the contract is exempt from closing fees. For example, if the discount rate of X is 1.00 and the transaction fee rate is 0. 1‰, the corresponding closing fee rate is1.00 * 0.0001= 0.0001.