CY/T 6-1991 "gravure printing mass requirements and inspection methods" stipulates the gravure printing mass requirements and corresponding inspection methods for book printing products. This standard applies to high-mass gravure printing made by fine plate making and printing, and Miscellaneous type gravure printing products can also be referred to. The standard refines the mass requirements of monochrome and color gravure printing products, including specific indicators such as order adjustment value, level, dot clarity and layout uniformity. By implementing this standard, we can ensure the high-mass performance of printing products in terms of vision and technology, and improve the visual effect and market competitiveness of printing products.