According to Article 3 of the Electronic Signature Law, in civil activities, the parties may agree to use or not use electronic signatures and data messages. A document with electronic signature or data message agreed by the parties shall not be denied its legal effect just because it is in the form of electronic signature or data message.

The provisions of the preceding paragraph do not apply to the following documents:

(1) Personal relationships such as marriage, adoption and inheritance are involved;

(2) involving the transfer of rights and interests of real estate such as land and houses;

(3) involving the suspension of water supply, heat supply, gas supply, power supply and other public utility services;

(4) other circumstances in which electronic documents are not applicable as stipulated by laws and administrative regulations.

that is to say, except for the above four cases that are not applicable to electronic signature (electronic signature), electronic signature (electronic signature) can be used in other cases. For example, an enterprise's labor contract, product purchase and sale contract, supplier contract and internal daily examination and approval can all use electronic signatures to realize online quick signing and examination and approval, thus improving the operational efficiency of the enterprise.