Illegal, in private lending, when the agreed interest exceeds four times that of the bank in the same period, it belongs to usury, which is a criminal act, and the part that exceeds the interest stipulated by law is not protected by law. Folk usury may seriously involve the crime of lending at high interest rate. The crime of usury refers to the act of usury of credit funds from financial institutions to others for the purpose of lending in violation of state regulations, and the illegal income is relatively large. According to Article 211 of the Contract Law: "If the loan contract between natural persons stipulates to pay interest, the loan interest rate shall not violate the relevant provisions of the state on limiting the loan interest rate". According to the Supreme People's Court's Opinions on People's Courts Handling Lending Cases, "the interest rate of private lending can be appropriately higher than that of banks, but the maximum shall not exceed 4 times that of similar loans of banks".