Method 1: Look at the volume/position.
According to the meaning of futures main contract, we can open the quotation software and compare the trading volume of all futures contracts, the biggest one is the main contract.
Method 2: Friendly futures software.
For example, when we open the Wenhua financial futures trading software, we can see the white title at the bottom, click on the main contract list, and the displayed interface lists the current main contracts of all futures varieties, with specific dates, which can be traded directly.