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 Law of People's Republic of China (PRC), the guarantor of general guarantee provides the creditor with the true information 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.