1. When a debtor brings a suit of subrogation to a third party, it shall meet the following conditions: (1) The creditor's rights against the debtor are legal; (2) The debtor's delay in exercising the due creditor's rights has caused damage to the creditor; (3) The creditor's rights of the debtor have expired; (4) The debtor's creditor's rights are not exclusive to the debtor. 2. Legal basis: According to the Contract Law of People's Republic of China (PRC), if the debtor delays in exercising its due creditor's rights, thus causing damage to the creditor, the creditor may request the people's court to subrogate the debtor's creditor's rights in its own name, except that the creditor's rights belong exclusively to the debtor. The scope of subrogation is limited to creditor's rights. The necessary expenses for the creditor to exercise subrogation shall be borne by the debtor.