It is illegal to imitate the signature of others. If the actor has no power of agency, exceeds his power of agency or continues to act as an agent after the termination of his power of agency, it will have no effect on the principal without ratification by the principal. The signed contract may constitute contract fraud, and other corresponding contracts may constitute financial fraud and bill fraud. If it is in the course of litigation, it may constitute the crime of obstructing testimony and perjury. If it is a fake star signature for sale, it should be an infringement of the right to name, and if the amount is particularly large, it can also be considered as fraud.

How to deal with forging others' signatures

1. Forging other people's signatures will be investigated for legal responsibility, and the specific legal responsibility depends on the purpose of the actor. For fraud, criminal responsibility can be investigated according to the crime of contract fraud and fraud;

2. Signing a contract in the name of a fictitious unit or others;

3, forged, altered, invalid bills or other false proof of property rights as a guarantee;

4. Without actual performance ability, first perform a small contract or part of the contract to trick the other party into continuing to sign and perform the contract;

5. Escape after receiving the other party's goods, payment, advance payment or secured property;

6. defrauding the other party's property by other means.

Legal basis: Article 171st of the Civil Code of People's Republic of China (PRC).

If the actor has no power of agency, exceeds his power of agency or terminates his power of agency, he will still carry out the agency act, and it will have no effect on the principal without ratification by the principal.

The counterpart may urge the principal to ratify it within 30 days from the date of receiving the notice. If the trustor fails to declare it, it shall be deemed as refusal to ratify it. Before the act committed by the actor is ratified, the bona fide counterpart has the right to revoke it. Revocation shall be made by notice.

If the act committed by the actor is not ratified, the bona fide counterpart has the right to demand the actor to perform the debt or demand the actor to compensate for the damage he has suffered. However, the scope of compensation shall not exceed the benefits that the counterpart can obtain when the principal ratifies.

If the counterpart knows or should know that the actor has no right to act as an agent, the counterpart and the actor shall bear the responsibility according to their respective faults.