Trading margin refers to the funds occupied by the contract in the exchange account to ensure the performance of the contract. The minimum trading margin for fuel oil futures contracts is 8% of the contract value. The exchange sets different trading margin collection standards according to the different positions of a futures contract and the different stages of listing operation. The specific provisions are as follows: In the course of trading, when the positions of fuel oil futures contracts reach a certain level of total positions, the standard for collecting trading margin will not be adjusted temporarily. At the time of settlement on the same day, if the position of a certain fuel oil futures contract reaches a certain level of the total position, the exchange will charge the trading margin corresponding to the total position for all positions of the contract. If the margin is insufficient, it shall be supplemented before the market opens on the next trading day. ? When the fuel oil futures contract reaches the standard that the trading margin should be adjusted, the exchange shall settle all historical positions of the contract in accordance with the new trading margin standard at the time of settlement on the trading day before the implementation of the new standard. If the margin is insufficient, it shall be added before the market opens on the next trading day. After entering the delivery month, the seller can use the standard warehouse receipt as the performance guarantee for the futures contract positions with the same number as shown in the delivery month, and do not charge the trading margin corresponding to the positions.