In the processing of manufacturing, the rising of temperature caused by friction heat, cutting heat, ambient temperature and other factors will lead to thermal deformation of the driving components of machine tool, so that the correct position between the tool and work piece will be changed. And at the same time, machine tool will lose its intrinsic accuracy and reduce its reliability. Especially in the precision cutting processing, machining errors caused by the thermal deformation of driving system will not be ignored, almost accounting for 40%~70% of the total errors. This paper is aided by a key project called ‘High-end CNC machine tools and basic manufacturing equipment’. By using CAE software ANSYS, the temperature field of axial driving system is gain through analyzing the steady-state thermal of machine tool. The experiment is used to capture physical picture of temperature field. At last, compared with the result of the experiment, we can know better the reliability of the analysis results. The results can be useful references for different axial driving system design in numerically controlled machine tool.