In order to explore the influence of water content on the shear behavior of subgrade filler,the typical filler of remolded low liquid limit clay was taken as the research object,which was obtained from Yue-Qian Section of G35 Ji-Guang Expresswayi n Dabie Mountain Area of Anhui Province.The direct shear test in laboratory was carried out to analyze the change laws of shear strengths and strength parameters of the soil samples with different water content and dry densities.The test results show that the increase of water content can reduce the shear strengths,cohesion force and internal friction angles of the soil samples,and the influence of water content on the cohesion force is obviously greater than that on the internal friction angles.The regression analysis indicates that there is a linear negative correlation between internal friction angles and water content with different dry densities,while the negative correlation between cohesion force and water content is anatu- ral exponential function.Meanwhile,there are also significant linear correlations between the regression parameters and the dry densities in the two groups of relation models.Thus,the relation model of Mohr-Coulomb shear strength was obtained expressed by water content,dry density and vertical pressure.It is verified that the model has high prediction accuracy,and it can provide the decay model of shear strength parameters for the influence analysis of rainfall in filtration on slope stability of operating embankment in the area.