Proof of financial resources: it can be a payroll record issued by a bank, an income tax withholding certificate, or a market value certificate of a house, a car, a deposit or an investment (such as a copy of the property ownership certificate/car driving license/bank time deposit certificate) and other materials that can prove your economic level. Other documents for reference include: personal account list of social insurance in the last 6 months, water, electricity and gas bills, credit card bills of other banks, etc.