It’s very simple, because a futures account supports up to 5 different bank cards to be bound at the same time (i.e. bank futures contract), but each bank can only bind one bank card at most.

Add a new bank card: For example, if your original card is bound to China Construction Bank, and now you want to add an ICBC card, no operation is required on the futures side, and no operation is required on the CCB side. You only need to log in to CCB online banking for banking futures. Just sign the contract;

Modify the bank card: For example, if you were originally bound to the CCB A1 card, and now you have a new A2 card, and you want to replace the old A1 card, you need to log in to online banking. Just cancel the bank contract for the old card and then apply for the bank contract for the new card;