In futures trading, the delivery month refers to the month when the contract expires, and the month before the delivery month refers to the period one month before the delivery month. Futures can be opened one month before the delivery month, which means futures contracts can be bought and sold. According to the stipulations of Dashang Institute and Zhengshang Institute, before the closing of the last trading day one month before the delivery month, the speculative positions of futures operating institutions and customers entering the delivery month should be adjusted to corresponding integer multiples.