There are two forms of debt accession: the first is a special agreement between the creditor and a third person that the third person will bear part of the debtor's debt, or the debtor will transfer part of the debt to a third person to bear; The second is that the creditor and a third person, or the debtor and a third person, or the creditor, the debtor and a third person, jointly agree that the third person will join the original contractual relationship, form a joint relationship with the debtor, and jointly act as a joint debtor and be responsible to the creditor.
 [Legal Basis]
 In Article 552 of the Civil Code, if the third person and the debtor agree to join the debt and notify the creditor, or the third person expresses his willingness to join the debt to the creditor, and the creditor does not explicitly refuse within a reasonable period of time, the creditor may request the third person to bear joint and several debts with the debtor within the scope of the debt he is willing to bear.