30% advance loan means that when a borrower applies for a loan from a lending institution, it needs to pay a certain percentage of money in advance before the loan is issued. According to relevant public information, this ratio is 30% of the loan amount, that is, the borrower needs to pay 30% of the loan amount as a deposit before the loan is issued. This practice is to ensure the safety of the loan, and the prepaid money can be used as a guarantee to ensure the borrower's repayment ability and willingness, and at the same time reduce the risk of the lending institution.