【摘要】This paper sums up and compares the relation and the characteristic of different index series which is suitable to National Accounts,then discusses the issue of dynamical harmonization of index series.as well as the main method to solve it.It analyzes emphatically the necessity and feasibleness about substituting fixed-base index with chained index,and then analyzes the shortcoming of Sauerbeck Index which is generally applied in the national accounts and the nature of Fisher’s Chained Index. Use the experience of SNA,European and American countries,which are good for constant-price GDP accounting,this paper puts forward that constructing Year-of-year(Y-o-y)indices and annual index separately,and the construction of two index series are relatively independent.With the“3-step strategy”.improve and perfect the system of GDP accounting with fixed-price in China.