The guarantor of the guarantee contract has not signed it, so this contract is generally invalid. Unless the guarantor seals or fingerprints. According to the relevant laws and regulations, a guarantee contract shall be concluded in writing, and a written contract shall be established after the parties sign, seal or press their fingerprints.

legal ground

Article 469 of the Civil Code of People's Republic of China (PRC)

The parties may conclude a contract in writing, orally or in other forms.

Written form refers to contracts, letters, telegrams, telexes, faxes and other forms that can tangibly express the contents contained.

A data message that can tangibly express its content through electronic data interchange, e-mail, etc. , and can be retrieved at any time, are considered in writing.

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.

Article 502

A legally established contract shall come into force upon its establishment, except as otherwise provided by law or agreed by the parties.