The main contract futures will be notified separately. The exchange usually issues relevant announcements or notices to announce the replacement plan and timetable of the main contract in advance. Such announcements are usually published on the official website of the exchange, the information platform designated by the exchange or other media to ensure that market participants can understand and adapt to the replacement in time. The purpose of this notice is to ensure that market participants can trade smoothly in the process of replacing the main contract and make necessary adjustments and preparations.