Abstract: The indexed national bond is the new variety used recently in the western countries.The optimal quantity decision of indexed national bond in the total scale of national bonds depends on the dynamic games between the authority and investors.The paper has set up the dynamic game model for the quantity decision of indexed national bond and found the ways to make the quantity decision of indexed national bond on the condition of time consistence,time inconsistence and the interference of the Central Bank.It got the conclusion that the optimal quantity of the indexed national bond in the case of time inconsistence is more than that in the case of time consistence,in addition,the accurate quantity will be obtained if considering the game between Department of Finance and Central Bank.The above results will set the foundation for the introduction of the indexed nation bond in China.

Key words: indexed national bond, quantity decision, game model