One of the common problems of laser marking machine is uneven marking effect, mainly reflected in cleaning the bottom of the obvious bump, horizontal and vertical interface marking effect is obviously uneven; marking, there is a clear vertical line between the character and non-character. The heavier the scratches, the more obvious the phenomenon. The reasons for uneven marking effect are. 1. Unstable laser switch power supply. 2. The manufacturing speed is too fast to keep up with the response time of the laser tube. 3. Optical path errors or focal errors can lead to uneven light transmission and bottom edge. 4. Unreasonable choice of focusing lens, should try to choose short focus lens to improve the light quality. Uneven solutions are as follows. 1. Replace the inspection power with a laser switch. 2. Reduce the production processing rate. 3. Check whether the optical path is correct. 4. Use short-focus lens, focusing needs to consider the depth of production and manufacturing