Before futures trading, you must deposit your own funds into a special futures margin account before you can start trading. After trading every day, the exchange and settlement members settle accounts for customers. After settlement, funds will be transferred automatically without manual operation. If the balance of the account is insufficient after settlement, additional margin is required, that is, money needs to be transferred into the account. If you don't add margin, the exchange will even out the position in your account, so you should pay attention to the position and balance of your account.