The account opening branch refers to the business outlet that handles the account opening procedures. In layman's terms, when you first apply for a passbook or bank card, the bank that issues the card to you will have it registered in the passbook.

The steps to inquire about China Merchants Bank’s account opening branches are as follows:

1. On the main page of China Merchants Bank’s mobile banking, find the headset icon in the red box at the top of the page as shown below, and click to enter.

2. After entering, find the "Account Bank Inquiry" item and click to enter.

3. After entering the bank where the account is opened, enter the complete card number of the bank card you want to query.

4. After the verification is passed, you can see the bank where the bank card is opened.

Baidu Encyclopedia-Account Opening Bank