Between ultrafiltration and reverse osmosis nanofiltration is between a membrane separation technology, its molecular weight cutoff in the 200-1000 range, the pore size of several nanometers, so called nanofiltration. Nanofiltration technology based on the superior features, its in the pharmaceutical, bio-chemical industry, food industry and other fields show potential applications. Nanofiltration technology in the food industry, pharmaceutical industry and other fields is very wide, our company personnel with the characteristics according to nanofiltration, combined with his own work in research or production to expand the applications.