Abstract：For high concrete faced rockfill dam，the grain crushing is so large in high stress field which may increase the deformation rate of dam body that it should be considered in numerical calculation. Because the traditional constitutive model for rockfill material can not reasonably reflect the effects of grain crushing，the calculation deformation of dam body is much different from its measured deformation. Tianshengqiao CFRD (concrete faced rockfill dam) is the first 200 m class high dam which has abound observation date in the similar of type built dam in China. Based on binary medium model considering grain crushing of rockfill material，the stress-strain behavior of dam body is analyzed by planar finite element method(FEM). Because the dilatancy quantity of dam materials will decrease and their corresponding shrinkage quantity will increase when the grain crushing is considered in numerical calculation，the calculation results of the suggested model is more accurate in qualitative analysis and more reasonable in quantitative analysis. It could be better to be used simulate stress-strain behavior of CFRD，especially high CFRD.
