Legal analysis: Signature is just a general term for signature and seal, not necessarily signature and seal. Some documents need to be signed and sealed, while others are not. Just sign or seal. For example, the certificate letter or letter of introduction can only be official seal, without the signature of the handler or legal person; Only the signature is required in the payee column of the accounting reimbursement form. However, some important legal documents, such as purchase agreements and labor contracts, must have both official seals and the signatures of legal persons or responsible persons.

legal basis: article 493 of the civil code of the people's Republic of China, if the parties conclude a contract in the form of a contract, the place where the contract is established shall be the place where the parties finally sign, seal or fingerprint, unless otherwise agreed by the parties.