Abstract: To obtain the influence rule of machine tool erroron gear tooth surface profile, the surface error factors of face gear machining based on face gear grinding machine were analyzed, including the relative position factors and the moving process factors during the machining process. This paper proposed a method of calculating the normal error of tooth surface. First, the influence rule of the main error parameters on the normal error resulting from the face gear surfacemachining was analyzed with MATLAB software. Second, the tooth surface deviation of face gear caused by each axis of machine tool was extracted. Finally, a mathematical expression of machine adjustment parameters was formulated. The calculation results show that the errors during the grinding process have different degree effects, and the normal error can be reduced quantitatively and adjusted the location of each tooth point of the face gear by adjusting the values of each error parameter, which provides a theoretical basis for adjusting the parameters of the machine tool in the actual NC machining.