As the earliest developer and manufacturer of roller press in China, Haijian produced the first roller press in the late 1980s by introducing advanced technology and won the first silver metal in international fair for Chinese building materials industry. Afterwards, the company constantly strengthened cooperation with domestic renowned universities and scientific research institutions. Thus, through introduction of technology and talents, and joint efforts to break through technology difficulties, we have been always taking the leading position in energy saving key technology and equipment of cement clinker sintering system and cement grinding system. Currently, our roller press system is typically equipped with D separator and V separator which can contribute to 99% powder separating rate. Additionally, after utilizing this equipment, some cement plants can achieve 40-50% power energy conservation and 30-45% production output improvement, remarkably increasing economic benefits. Thereby, Haijian roller press is an ideal choice of cement production line grinding system for reducing energy consumption and increasing production.