1. One-way filing method. That is to say, the moving direction of the file is always perpendicular to the jaw. In order to file the surface energy evenly, it will move 5 ~ 10 mm to the side every time it is filed back. Mainly used for rough filing plane.

2. Cross filing method. That is, the moving direction of the file crosses the surface of the workpiece, which is mainly used to trim the file plane.

3. Push file method. Suitable for polishing before filing, usually with a thin file. The operation method is: hold the file body horizontally with both hands, keep your thumb close to the workpiece, and push the file back and forth smoothly along the workpiece with consistent force, so as not to scratch the surface of the workpiece and reduce the cutting depth.