There are many kinds of flat flat (slant flat) label printing machines, mainly from Japan, Taiwan, South Korea, etc., the rest are domestic similar equipment. The advantages of this model are fast speed, high efficiency, suitable for small label production, especially suitable for VIP label production. Suitable for general dot, line and text printing. The disadvantage is that it is not suitable for large-scale field printing, which will cause uneven ink color. Circular flattening intermittent paper feeding label printing machine is represented by B-100 series label printing machine of FSK company in Japan. The domestic equipment is lybq4230 label printing machine produced by Taihang printing factory, and a small number of similar equipment from Taiwan and South Korea. The advantage of this machine is that it has a wide range of printing trial printing, that is, it can print dot or line text, which is suitable for large area field printing. The disadvantage is that the speed is slow. Because of the transmission, the overprint accuracy is low, so it is not suitable for high-grade label printing. The rotary label printing press with circular and continuous paper feeding improves the advanced label equipment, represented by KO pack and sanky of Japan and labelman of Taiwan. The advantage of this machine is that it is suitable for all kinds of label printing, especially for high-grade label printing. The disadvantage is that different specifications of the label to replace the plate cylinder and die-cutting plate roller, resulting in customer investment, printing adjustment, preparation time is long. This type of printing press is represented by lp-300 of Lintec company in Japan. The manufacturers of similar equipment include Yanqi company in Japan and Wantong company in Taiwan. The advantage of this kind of equipment is that the label within a certain size range can be printed on a unified drum without changing the drum. The disadvantage is that the machine itself has no web deviation correction system and random tension control, so the printing positioning accuracy completely depends on the cutting accuracy of the printed material.