Forging someone else's signature constitutes fraud. If it is used to make 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 necessarily constitute a criminal offence. 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 conditions for determining the crime of forging evidence are:

1, the subject is a general subject, and 16-year-old natural person with criminal responsibility can constitute it;

2. Helping parties to forge evidence, including criminal litigants and civil, economic and administrative litigants;

3. In the crime of forging evidence, evidence is evidence in criminal proceedings, and it can also be evidence in civil, economic and administrative proceedings;

4. The object of the crime of forging evidence is the normal criminal litigation activities of judicial organs, including the normal civil, economic and administrative litigation activities of judicial organs.

To sum up, those who help the parties forge evidence, threaten or induce witnesses to change their testimony to facts or commit perjury shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention; If the circumstances are serious, they shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years.

Legal basis:

Article 280 of the Criminal Code of People's Republic of China (PRC).

Crime of forging, altering, buying and selling official documents, certificates and seals of state organs; Crime of stealing, seizing or destroying official documents, certificates and seals of state organs Whoever forges, alters, buys or sells or steals, seizes or destroys official documents, certificates and seals of state organs shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention, public surveillance or deprivation of political rights and shall also be fined; If the circumstances are serious, 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.

Crime of Forging the Seal of a Company, Enterprise, Institution or People's Organization Whoever forges the seal of a company, enterprise, institution or people's organization shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention, public surveillance or deprivation of political rights and shall also be fined.

Crime of forging, altering or buying and selling identity documents Whoever forges, alters or buys or sells resident identity cards, passports, social security cards, driver's licenses and other documents that can be used to prove his identity according to law shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention, public surveillance or deprivation of political rights, and shall also be fined; If the circumstances are serious, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years and shall also be fined.