The driving forces of China's Economic Growth are investigated in this paper based on the 1997 2002 and 2007 input-output data and the following conclusions are gotten: (1) The sources of China's economics growth during 1997-2007 was mainly from the pull effect of final demands.(2) The deriving forces are different among sectors. The sources of China's agriculture and tertiary industry during 1997-2007 was domestic consumption demand while the secondary industry dependent on investment and export demand.(3) The engines of China's economics had changed during the decade. On the first half of the stage, the domestic consumption play dominant role while the contribution of export had increased on the later half of the stage.