Futures trading refers to the trading activities of buying and selling futures contracts on futures exchanges. 1, buying stock index futures is a buying behavior, including opening positions, closing positions today and closing positions. 2. Buying stock index futures is a buying behavior, including selling and opening positions, and selling and closing positions. 3. Buying and opening positions: refers to buying multiple orders when placing an order, that is, the bullish index. 4. Selling and opening positions: refers to buying an empty order when placing an order, that is, bearish or bearish index. 5. Buying and closing positions: refers to selling more than one order when placing an order. 6. Close the position by selling: refers to selling the bought empty order when placing an order. 7. Buying Ping Jin: refers to selling multiple orders bought on the same day when placing an order. 8. Selling flat today: refers to selling empty orders bought on the same day when placing an order.