Hey @zhongjicike,
It looks like you may have changed which EA account was linked to your Xbox gamertag, rather than just updating the email address on the existing account.
If you're looking to update the email address on your EA account without changing the actual linked account, you can do that from this account page.
In this case since you've unlinked the accounts, that will cause your progress to be lost as that is not transferable to a new account. To revert this you would need to re-link the original accounts with these steps.
Please contact support directly if you're running into any trouble with that process and they will be able to take a closer look at the account, thanks!