according to the electronic signature law of the people's Republic of China, electronic signature refers to data transformation by electronic means, which is used to identify the main body of an electronic document and identify the data that it recognizes the contents of the electronic document. Therefore, when using a brush to sign a word document, if it meets the relevant provisions of the electronic signature law, such as the requirements of uniquely identifying the signer's identity and ensuring the authenticity, integrity and non-repudiation of the signature, then the signature can be recognized as an electronic signature with legal effect.

in order to ensure the validity of the electronic signature, it is recommended to verify the identity before signing, such as confirming the identity of the signer by means of password and digital certificate.