Volume is a manifestation of the relationship between supply and demand, which refers to the number of transactions in a time unit. When the demand exceeds the supply, the crowd is surging, and everyone wants to buy it, so the transaction volume will naturally increase; On the contrary, the supply exceeds the demand, the market is deserted, the buying gas is scarce, and the trading volume will inevitably shrink. Digitizing the crowd is the transaction volume. The turnover in a broad sense includes the number of shares traded, the turnover amount and the turnover rate; In a narrow sense, it is also the most commonly used one, which only refers to the number of stocks traded.

Volume refers to the total number of shares traded on that day (1 lot = 100 shares). VOL shows 1M, which is 1m = 1m internationally. 1K= 1000, 1M= 1 billion, 1b = 1 billion.

Inventory refers to the sum of the number of contracts that have not been reversed by buyers and sellers. The size of the position reflects the size of the market transaction and the difference between the long and short sides in the current price. By analyzing the change of positions, we can analyze the size, change and renewal of long and short forces in the market, thus becoming one of the technical analysis indexes different from stock investment. In the analysis of futures graphic technology, it is very important to cooperate with each other in volume and position.