The warehouse receipt of the futures exchange is the statistics of the exchange itself, which is divided into positions and transactions, and is the positions and transactions of both parties. The warehouse receipt of futures position is the number of sales contracts held by both long and short parties, not the actual number of goods, nor the number acquired by the exchange. The exchange only provides a trading platform and cannot participate in trading in principle. The exchange doesn't know the output of a product within one year, and the trading warehouse receipt is also called the trading volume, which is different from holding positions. There is no necessary connection between trading volume and spot production. In a word, the warehouse receipt is provided by the exchange. Positions and spot positions do not correspond, but contract positions. The more contracts signed by both parties, the bigger the position. Trading warehouse receipts, also known as trading volume, are not necessarily related to the spot, but the sum of long and short positions.