The supporting documents required for applying for Huaxia Bank's credit card are as follows:

1. Identity certificate: the applicant must be 18-65 years old, and neither minors nor retired employees can apply for credit cards; (essential)

2. proof of income: that is, your monthly salary, which can provide work certificate or bank account running water; (mandatory)

3. Financial proof: mainly refers to your deposit, real estate license, driving license, etc. (optional)

you can try to apply for the above documents, you can choose to apply for a credit card at a nearby Huaxia Bank outlet, you can also contact a business person to apply at home, or you can apply online. It is recommended to choose a formal channel.