When the customer does not have a credit card that meets the requirements, others can provide credit guarantee on his behalf, and the guarantor shall bear unlimited joint and several liability for all expenses and responsibilities incurred by the lessee during the lease period; The credit card guarantor shall show valid identification and hold a valid credit card with sufficient credit line, and sign a car rental contract with the car renter; Each guarantor can only guarantee one car at a time, that is, before the car he guarantees is returned, he can't guarantee the rental of other cars.