The author used Super-logarithmic production function to calculate and analyze the fluctuation as well as the trend of total factor productivity(TFP) of Jiangxi economy.The case analysis reached a conclusion that Jiangxi's TFP had improved gradually since China began reform and open policy,but economic growthstill mainly depended on capital input,so still belongs to roughly growing economy.The further study shows that the larger extent of the absolute economic growth,the less the TFP growth rate is.Therefore,we have to pay more attention to science and technology input,promote technological progress,meanwhile attaching more importance to the stability of economic growth to realize effective resource allocation and sustain economy increase.