Legal analysis: Forging others' signatures constitutes fraud. If it is used for perjury, it constitutes perjury. If it is used to forge government documents, the circumstances are even more serious. Signature has legal effect, and forged signature bears legal responsibility. However, just forging a signature does not constitute a criminal offence, and it is necessary to comprehensively judge whether it constitutes a crime and what kind of crime it constitutes by combining the specific behavior, social harm and harmful consequences after forgery. The crime of contract fraud refers to the act of defrauding the other party of a large amount of property by fabricating facts or concealing the truth in the process of signing and performing a contract for the purpose of illegal possession.

Legal basis: Article 266 of the Criminal Law of People's Republic of China (PRC) defrauds public or private property, and if the amount is relatively large, he shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.