The agreement to lend special national debt is legal. The purpose of special treasury bonds is to provide financing for specific public projects and support social development fields such as infrastructure construction, education and medical care. These bonds are issued by the government or its designated institutions, and the purpose and scope of use are clearly defined. Loan agreement refers to the agreement that creditors transfer their creditor's rights to a third party. In some cases, the holders of special government bonds will choose to transfer their creditor's rights to other institutions or individuals, and this transfer needs to stipulate the rights and responsibilities of all parties through loan agreements. Therefore, the government bond lending agreement is legal.