The credit card guarantor needs to provide material proof of identity, financial proof, credit record, and letter of guarantee.

1. Proof of identity. The guarantor needs to provide valid identity documents, such as ID card, passport, etc.

2. Proof of financial status. The guarantor needs to prove his or her financial status, such as providing bank statements, salary slips, tax certificates, real estate certificates, etc.

3. Credit record. The guarantor needs to provide his or her credit record and credit report to prove that his credit status is good.

4. Letter of Guarantee. The guarantor needs to sign a letter of guarantee, promising that he is willing to bear the debt of the principal cardholder if he cannot repay the loan on time.

5. Other supporting documents. According to different bank and credit card application requirements, other supporting documents are required, such as work certificate, social security certificate, real estate certificate, etc.