Legal analysis: the loan guarantor must sign. If the guarantor is a company, it shall be stamped with the company seal or signed by the legal representative. The loan guarantor establishes a guarantee contract relationship with the lender. The guarantor does not sign the guarantee contract or the guarantor in the loan contract, and the guarantor and the lender do not establish a guarantee contract relationship, so there is no guarantee responsibility.

Legal basis: Article 698 of the Civil Code of People's Republic of China (PRC) generally guarantees that the guarantor will provide the creditor with the real situation of the debtor's executable property after the expiration of the main debt performance period. If the creditor gives up or is slow to exercise his rights, resulting in the property being unenforceable, the guarantor will no longer bear the guarantee liability within the value range of the executable property provided by him.