Aimed at complex problem of the carrying of liquid hybrid bearing for ultra-high speed grinding,the oil film pressure field distributions in different input state were obtained through CFD analysis on the bearing by FLUENT software.On this basis,the bearing characteristics were analyzed,laws of bearing capacity changing along with the input parameters were obtained,and the significance of each input parameters was analyzed through orthogonal experiment.The results show that the relationships between bearing capacity and eccentricity as well as oil supply pressure are approximately linear,and the relationship between bearing capacity and speed is non-linear.In lower speed,along with speed increasing,bearing capacity remains unchanged basically,in moderate speed,along with speed increasing,bearing capacity is increased.In high speed,along with speed further improving,there is a downward trend in bearing capacity.The effect of oil supply pressure on the bearing capacity is more significant than that of speed.