During the operation of a new type hybrid differential rotary table,the negative pressure may appear in the outer groove area of the static pressure chamber,which makes the oil supply of the dynamic oil wedge insufficient and affects the accuracy of the analysis of the oil film temperature rise characteristics.In order to accurately study the oil film temperature rise characteristics,the maximum speed corresponding to different oil film thickness was calculated by FLUENT when negative pressure was not generated in the outer groove area of the static pressure chamber under different oil supply pressure,and the corresponding curve of maximum speed and film thickness was fitted by MATLAB.It is concluded that with the increase of oil film thickness and oil supply pressure,the maximum rotating speed is increased gradually when there is no negative pressure in the outer groove of the static pressure chamber.The effects of rotating speed,oil supply pressure and oil film thickness on the temperature rise characteristics of oil film were studied under the condition of ensuring the oil supply of the dynamic pressure spiral oil wedge.The results show that the rotating speed has a obvious effect on the temperature rise of the oil film,and the oil film temperature is increased with the increase of rotating speed.With the increase of oil film thickness and oil supply pressure,the oil film temperature is decreased gradually,and the larger the oil film thickness and oil supply pressure,the less obvious the oil film temperature rise at low speed