You don't have to cancel, it's up to you. If the deposit in the bank card associated account meets the minimum deposit requirements of the bank, there is no need to pay the annual fee. Then your dollars have been deposited in this account. If you return it later, you can keep your account, otherwise, it is of limited significance to keep your American account in China. Bank accounts in the United States can always be valid, but the bank card connected to the account has a validity period. If you return to the United States in the future, your bank card will expire and you need to apply for a new card to spend.

Failure to cancel will not affect future entry into the United States.