Electronic signature writing of production records of pharmaceutical enterprises. The production records of pharmaceutical companies need electronic signatures to facilitate document entry and printing. Electronic signature refers to the data contained in the data message in electronic form and accompanied by data used to identify the identity of the signer and show that the signer approves its content. Electronic signature is an electronic signature of electronic documents through cryptographic technology, not a digital image of handwritten signature, but an electronic seal similar to handwritten signature or seal. The purpose of electronic signature is to sign the electronic version of Mid-Autumn Festival greeting cards, invitations and construction contracts.