Abstract: Study on the dynamic mechanical properties of hydraulic asphalt concrete under compressionshear load is important to ensure the safe operation of asphalt concrete core wall earth-rock dams. In this paper, we use an independently-developed compression-shear test device to study the dynamic mechanical properties of hydraulic asphalt concrete at different shear rates(0.0005 s^-1, 0.001 s^-1, 0.005s^-1 and 0.01 s^-1) under different temperatures（5 °C and 15 °C） and different normal stresses（1 MPa, 2MPa and 3 MPa）. The results show that each specimen has obvious characteristics of oblique shear failure, and different normal stresses or shear rates impose an impact on its failure mode and shear stressstrain curve to different degrees. With increasing the normal stress or shear rate, shear strength and shear modulus increase; peak strain increases with the decreasing normal stress or increasing shear rate. Using the Mohr-Coulomb criterion, we obtain the laws of two strength parameters-cohesion c and internal friction angle φ of hydraulic asphalt concrete-varying with shear rate.