When a legal person serves as the legal representative of multiple enterprises at the same time, the use of a legal person seal is not recognized by law. The use of the corporate seal is limited to specific legal procedures, such as tax declaration and invoicing, etc., and its effect is limited to indicating the behavior of the legal person, not the behavior of an individual. If a legal representative misuses his or her company's corporate seal when acting on behalf of another company, the legal representative will bear the legal consequences of his or her actions.

The use of the legal person seal involves clear official behavior, that is, when signing a document, the personal signature combined with the legal person seal can confirm that this is an official behavior and not the behavior of the individual signer. If a legal person hands over his seal to another person, he must expressly grant agency authority and assume responsibility for it. The code below the legal person seal is the legal person code, which is a unique identification issued by the state to all enterprises and is used for unique identification nationwide.

It is worth noting that according to the provisions of the "Company Law", the company's provision of guarantees for shareholders or actual controllers requires a resolution of the shareholders' meeting or general meeting of shareholders. Although this is the company's internal management rule, in terms of judging the validity of the contract, unless the creditor fails to perform the formality review obligation, the legal representative's guarantee behavior that exceeds his authority may still be deemed valid. Only when the creditor can prove that it has fulfilled its duty of reasonable review, can the legal representative's behavior beyond his authority be regarded as apparent representation, thus affecting the validity of the guarantee.