It is suggested that the number of short positions in the stock index futures market increase, that is, the number of short positions increases. Empty orders are equal to multiple orders, and the sum of empty orders and multiple orders is the position, which means that half of the positions are empty orders, and its value is also equal to multiple orders. Empty order refers to the two concepts of long position and short position in spot and futures. Long means buying at a low price and selling at a high price, while short means selling at a high price and selling at a low price. To put it bluntly, bulls watch the market rise and bears watch the market fall. The contracts held by bulls are multiple orders, and the contracts held by bears are empty orders. More than that: in futures trading, holding futures contract positions is called holding positions. Among them, holding multiple positions is called holding multiple orders, which is referred to as holding multiple orders.