In order to study the dynamic mechanical characteristics and stress wave propagation law of filled joint rocks under different confinement angles and different confining pressures,the impact test was carried out on sandstone specimens with a filling joint thickness of 8 mm by using the modified dynamic and static combination loading(split hopkinson pressure bar,SHPB)device.The dynamic mechanical characteristics and stress wave propagation laws of filled joints under different confining pressure grades(0,4,6 and 8 MPa)and different joint inclination angles(0°,15°,30° and 45°)were studied,and the stress wave oblique emission theory was used and verified.The experimental results show that ①The re-flected amplitude of intact sandstone is the smallest.Taking 0 MPa as an example,the reflected amplitude increases from 0.194 × 10-3 to 0.299 × 10-3,which is positively correlated with the inclination,and the transmission amplitude is negatively correlated with the inclination angle from 0.169 × 10-3 to 0.053 × 10-3.Taking 0° as an example,the reflected amplitude is negatively correlated with the confining voltage,which decreases from 0.194 x 10-3 to 0.074 x 10-3 and the transmitted amplitude increases from 0.169 × 10-3 to 0.257 × 10-3.②Under the action of impact dynamic load,a certain degree of confining pressure can limit deformation,inhibit cementation surface separation,and improve bearing capacity.The larger the inclination angle of the joint,the greater the deformation of the filling joint,and the worse the bearing state.③With the increase of confining pressure,the reflectivity decreases and the transmission capacity in-creases.The reflection coefficient of the 0° inclination specimen decreases from 0.603 to 0.147,and the transmission coefficient increases uniformly from 0.569 to 0.789.With the increase of inclination angle,the reflection capacity of the confining pressure specimen increases,while the transmission capacity de-creases,which is consistent with the theoretical analysis law.④The joint inclination angle is negatively correlated with the absorption energy density of the sample,but the confining pressure is positively correla-ted with the absorption energy density of the sample,which is consistent with the transmission reflection law under the action of confining pressure.