In order to reveal the influence of longitudinal-torsional ultrasonic vibration on the grinding force of grinding zirconia ceramics,the kinematic characteristics of longitudinal-torsional ultrasonic grinding (L-TUG) was analyzed,a single diamond abrasive particle scratching zirconia simulation was carried out by using ABAQUS,and the single abrasive zirconia grinding test was carried out.On this basis,the difference of materials surface stress between ordinary grinding (OG) and L-TUG was analyzed under simulation conditions;the influence laws of grinding characteristic parameters on grinding force of L-TUG were discussed.The results show that the grinding force simulation results of OG and L-TUG are in good agreement with the experimental results,the feasibility of the simulation is verified;compared with OG,the grinding stress of material surface can be effectively reduced by using the ultrasonic vibration;under the same characterization parameters,L-TUG axial force is always greater than normal force on the whole,and the influence degree and variation trend of L-TUG on axial force and normal force show different regularity.