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This research studied the preparation technology and properties of nanometer calcium carbonate by carbonization and organic coated method. Calcium oxide and carbon dioxide were used as raw materials, citric acid was used as the surface control agent, and appropriate amount of dispersing agent was used as surface modification to prepare organically modified nano-calcium carbonate. The product was quantitatively and qualitatively analyzed by a variety of instruments, such as the morphology of the sample, size, elements and chemical composition. The results showed that the prepared calcium carbonate’s average particle size was 60 nm; there was a slight soft reunion phenomenon; particle size distribution was narrow; surface has ionic bonded organic matter.