Log in to Taobao account, click "Account Settings" at the top of the page, and then click "Alipay Binding Settings" on the left, and "Binding Alipay Account Information" on the right.

The binding status shown in the red box above: Taobao account is bound, followed by "Unbind or change account" (hint: before changing account, you are advised to check whether the new Alipay account can be bound in advance). Then follow the system prompts.

Also note that if the account has seller behavior (the baby has been released and there are online goods), it is not supported to unbind the Alipay account.