The mark on the packaging is conventional ink spray code. The ink used for inkjet printer is mainly composed of butanone, diluent and cleaning agent. Butanone is volatile and microtoxic and smells bad. On the one hand, it is harmful to the health of the operators. On the other hand, it is easy to fall off on the surface of the packaging. It has some potential safety problems, especially on the surface of food packaging. The demand for marking content not to erasure and to avoid ink pollution is becoming more and more demanding. New marking technology is needed to be used in packaging and coding, so the laser marking machine is becoming more and more recognized by customers as a new marking tool.