Legal analysis: this kind of behavior is illegal, and if the circumstances are serious, it can constitute a crime, and the parties need to bear criminal responsibility according to law. Forged IOUs have no real loan relationship and are not protected by law. Creditors who hold IOUs claim rights from debtors, and they can argue that IOUs are forged. If the creditor is a person who forges debts, he can report the case directly to the public security organ.

Legal basis: Article 668 of the Civil Law of People's Republic of China (PRC) shall be in written form, unless otherwise agreed between natural persons. The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.