Signature means signature, seal or signature and seal. According to Article 7 of People's Republic of China (PRC) Negotiable Instruments Law, the signature on a negotiable instrument is signature, seal or both. The signature of the legal person or other organization that uses the bill shall be the signature of the legal person or other organization plus the signature of its legal representative or its authorized agent. The signature on a bill of exchange shall be the real name of the party concerned. According to the nature of signature, it can be divided into legal person signature and natural person signature.