Volume refers to the cumulative total number of transactions from the beginning of the day to the time of statistics. Statistically, there are unilateral and bilateral differences. So, how to calculate the trading volume of stock index futures?

Where there is a transaction, there is a sale, and the two are absolutely equal in quantity. If someone buys 10 hands of Shanghai and Shenzhen 300 index futures and someone sells them at the same price, then this 10 hand is sold. If calculated unilaterally, the turnover is 10 lots, and if calculated bilaterally, it is 20 lots.

In China's domestic futures market, the trading volume is based on bilateral statistics, and overseas is basically based on unilateral statistics. The trading volume of Shanghai and Shenzhen 300 stock index futures is based on unilateral statistics.