Abstract: <SPAN lang=EN-US>As a functional filler,nano-sized calcium carbonate is widely used in many industries,but the calcium carbonate industry is also a high energy consumption industry.Enterprises should save energy,reduce consumption and promote green and environmental-friendly production methods in production.Energy saving and emission reduction methods in production of nano-sized calcium carbonate were systematically introduced through analyzing its each production procedure in detail,comparing each technology and equipment as well as through combining practical production experiences.Finally,energy saving equipment and technologies,such as automated shaft kiln,blade digestion machine,non-refrigerated mixing carbonization,wet modification,high-pressure compression,paddle-string secondary disc drying,tornado mill depolymerization,and automatic packing,were applied to save energy and reduce consumption in producing nano-sized calcium carbonate.Furthermore,the transformation of energy saving and emission reduction was also carried out inside the enterpirse and significant economic benefits have been made after the transformation. <BR></SPAN>