1. If you want to query the customer identification number of CCB, you can directly log in to corporate online banking, which can be seen in the upper left corner of corporate online banking.

2. Log in to corporate online banking for the first time. You need to log in with a silver screen. When logging in, the banking system will display the identification number.

3. CCB's customer identification number was given when signing the contract. You can find the customer identification number by logging in to the online banking to check the signing receipt.