The stock index is one point 300 yuan, with a minimum fluctuation of 0.2 points (60 yuan);

For example, if the Shanghai and Shenzhen 300 Index 201603010: 38 is 2900 points and the expected price falls, then I sell a stock index futures contract with a margin ratio of 10% and an occupation margin of 2900 * 300 *1. I choose to buy and close my position, so the profit is (2900 -2880) *300 yuan/point =6000 yuan, the yield is 6000/87000 = 6.9%, and the Shanghai and Shenzhen 300 Index is 201603013: 32 is 2877. The occupation deposit is 2870 * 300 *10% = 86100 yuan, 14: 18 and the price reaches 2920 points. I choose to sell my position, so the profit is (2920 -2870) *300 yuan/point = 65438.