Abstract: Inhomogeneous roadbed compacting is the common quality problem of high-filled roadbed, when analyzing deformation and failure of roadbed caused by it, the changes of physical mechanics parameters, such as deformation modulus and Poisson's ratio, must be considered. Based on the elastic theory, author has deduced the FEM analysis method which can consider deformation parameters changes, and analyzed deformation and failure characters of expressway high-filled roadbed in Sichuan Province, the result is OK。Obviously, this analysis has the forecasting and guiding meaning to high-filled roadbed design and construction.