Signature means signature+seal. If it means that the signature does not meet the requirements, it is invalid. You need to abide by the signing rules of the document.

Negotiable Instruments Law of People's Republic of China (PRC) (1May 1995 1995 adopted at the 13th meeting of the Standing Committee of the Eighth NPC);

Article 7 The signature on a negotiable instrument includes signature, seal or signature and seal.

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.