Margin for contract trading = contract value * 10%= CSI 300 index point *300 yuan, that is, the CSI 300 index point at the moment you trade stock index futures multiplied by 300 yuan and then multiplied by 10% is the margin you need to pay. For example, now the number of points in the Shanghai and Shenzhen index is 2300, so 2300*300* 10%=69000 yuan (yuan), which means a deposit of 69000 yuan is needed.