The market capacity of coaters in China has always been the focus of attention of manufacturers, users and professionals, because the market is an important indicator affecting industrial development. Foreign printing machinery manufacturers are also very concerned about the trend of China's printing machinery market. While opening up the Chinese market, they also actively study the market access policy of China, because China's printing machinery market is the second largest printing market in the world besides the United States. In order to obtain China's import tax exemption policy, they also use the opportunity of Chinese Leaders'visits abroad to mediate for the support of the tax exemption policy. How large is the market capacity of printing machinery in China and its future development trend are always in dispute. The market capacity of coaters in China has always been the focus of attention of manufacturers, users and professionals, because the market is an important indicator affecting industrial development. Foreign printing machinery manufacturers are also very concerned about the trend of China's printing machinery market. While opening up the Chinese market, they also actively study the market access policy of China, because China's printing machinery market is the second largest printing market in the world besides the United States. In order to obtain China's import tax exemption policy, they also use the opportunity of Chinese Leaders'visits abroad to mediate for the support of the tax exemption policy. How large is the market capacity of printing machinery in China and its future development trend are always in dispute.