The price limit system means that the transaction price of a futures contract cannot be higher or lower than a certain price range on the basis of the contract settlement price of the previous trading day. If the price exceeds this range, it will be considered invalid and cannot be traded.

The daily limit percentage of futures products is relatively unstable, and the daily limit percentage of different futures exchanges is also different, such as CICC 10% and Zhengshang Institute 5%. Different varieties have different daily limit. If the market is active, the exchange will adjust the daily limit percentage.