If a person is cheated to sign an IOU, the deceived person can apply to the court for cancellation. According to the law, if one party makes the other party commit a civil juristic act against its true meaning by fraudulent means, the defrauded party may request the people's court to cancel it.

Legal objectivity:

Article 148 of the Civil Code of People's Republic of China (PRC) * * * If a party commits a civil legal act against its true meaning by fraudulent means, the defrauded party has the right to request the people's court or an arbitration institution to cancel it. The third party in Article 149 of the Civil Law of People's Republic of China (PRC) commits fraud, causing one party to commit a civil juristic act against its true meaning. If the other party knows or should know about the fraud, the defrauded party has the right to request the people's court or arbitration institution to cancel it.