Guarantee contracts are all contracts between the guarantor and the creditor, because the guarantor assures the creditor that if the debtor does not repay in the future, the debt will be repaid by himself; The guarantee contract must be valid and signed (the company guarantee needs the approval of the shareholders' meeting, roughly); Joint guarantee, unless otherwise specified, is generally a joint liability guarantee. If the guarantor of joint and several liability guarantee and the creditor have not agreed on the guarantee period, the creditor has the right to require the guarantor to assume the guarantee responsibility within six months from the date of expiration of the independent debt performance period.