Legal analysis: No. There is a selective relationship between signature and seal, that is, the parties can sign without sealing, seal without signing, or sign and seal at the same time. When signing a written contract, it is not necessary to sign and seal it at the same time, because both the authorized signatory and the company seal represent the company and are corporate actions. If one party to the contract is a natural person, signature or fingerprinting is sufficient. If one party to the contract cannot be present to sign, his legally authorized personnel can sign on his behalf 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 person, or other persons authorized by the legal representative and the unit to sign on their behalf within the scope of authorization.

Legal basis: Article 490 of the "People's Republic of China and Civil Code" Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it. Laws and administrative regulations stipulate or the parties agree that a contract should be concluded in written form. If the parties do not use written form but one party has performed its main obligations and the other party accepts it, the contract is established.