Price limit refers to the maximum intraday price fluctuation allowed by futures contracts. Quotations exceeding this fluctuation range are considered invalid and cannot be traded. The fluctuation range of rebar futures contracts shall not exceed 3% of the settlement price of the previous trading day, and the exchange may adjust its fluctuation range according to market risks. When the rebar futures contract appears in the same unilateral market continuously, the price limit adjustment and trading margin collection standard of the futures contract correspond to the following table: when the futures contract appears in the same unilateral market on D3 trading day (that is, it reaches the price limit for three consecutive days), if D3 trading day is the last trading day of the contract, the contract will directly enter delivery; If D4 trading day is the last trading day of the contract, the contract will continue trading on D4 trading day according to the price limit and margin level of D3 trading day; In addition to the above two situations, the futures contract will be suspended for one day on the D4 trading day. On the D4 trading day, the Exchange decided to implement one of the following two measures for the futures contract according to the market conditions: Measure 1: On the D4 trading day, the Exchange decided and announced that on the D5 trading day, one or more measures such as unilateral or bilateral, the same or different proportion, raising the trading margin of some members or all members, etc. were taken to suspend the opening of new positions by some members or all members, adjust the range of price limit, limit the withdrawal of funds, close positions within a time limit, forcibly close positions, etc. to eliminate market risks, but after adjustment, the price limit was reduced. Measure 2: At the time of settlement on D4 trading day, the Exchange will automatically match the open declaration of closing price on D3 trading day with the closing price of profitable customers (non-futures company members, the same below) on D3 trading day according to the proportion of positions held.