The contract doesn't have to be signed and sealed. 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, it is the company's behavior, because both the authorized signatory and the company seal represent the company. 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.

Is it valid if one party of the contract fails to sign and seal?

Unless otherwise agreed by the parties, a contract without the signature and seal of one party is valid. If one party neither signs nor seals, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

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.

To sum up, two or more parties to a contract or agreement can freely agree on the effective conditions of the contract or agreement, including only stamping or signing, stamping and signing, signing and authorizing, etc. The parties may agree to take the form of signature as the condition of entry into force, or they may agree to take a certain period of time or special circumstances as the condition of entry into force.

Legal basis:

People's Republic of China (PRC) Civil Code

Article 490

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.