After customer feedback and our exploration in the sales process, it is found that nano-calcium carbonate powder or left and right activated calcium carbonate powder is the most suitable. However, the price of nano-activated calcium carbonate powder is high, so most of them use nano-activated calcium carbonate powder as ink production. Calcium oxide plays a role in reducing cost and increasing volume in ink. The ink market needs high-performance superfine calcium carbonate, also known as colloidal calcium carbonate and precipitated calcium carbonate. Its main characteristics are fine particles, about 0.02- 1.0(um), large specific surface area, large oil absorption, good transparency, good brightness and stability, and its application in ink is increasing day by day. The ink prepared with colloidal calcium carbonate has good adhesion and viscosity, good printing performance, fast drying and no side effects. Because of the small particles, when used in ink products, it shows excellent dispersibility, transparency, excellent gloss and hiding power, as well as excellent ink absorption and dryness, so the printed matter is fine and the dot is complete. Especially after resin binder is widely used in ink, colloidal calcium carbonate almost replaces other fillers with its excellent stability. Ultrafine calcium carbonate used in ink must be activated, and its crystal form is spherical or cubic. At present, most of the top-grade ink fillers in China use ultrafine calcium carbonate.