The benchmark warehouse is a delivery warehouse designated by the futures exchange, which is generally a national warehouse, such as cotton warehouses in Henan, Shandong, Jiangyin, Xuzhou, Wuhu and Hubei, and is generally a local cotton storage and storage. Non-benchmark warehouse refers to the warehouse with additional delivery. For example, in spot delivery, the registered warehouse receipt is that the seller is an enterprise and the buyer is another enterprise, and cotton can be picked up directly at the seller's warehouse, which is a non-standard warehouse. By the way, the benchmark warehouses are all published on the website of the exchange. You can find the address, contact person, telephone number and other information.