Legal analysis: the relationship between signature and seal is optional, that is, the parties can sign without seal, seal without signature, or both. When signing a written contract, you don't need to sign and seal it at the same time, because both the authorized signatory and the company seal represent the company and are company behaviors. If one party to the contract is a natural person, it only needs to sign or press the fingerprint. If one party to the contract cannot sign in person, its legally authorized personnel may sign on behalf of it within the scope of authorization; If one party to the contract is an enterprise unit, the signatory shall be the legal representative of the unit, or the legal representative and other personnel authorized by the unit shall sign on its behalf within the scope of authorization.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.