1. Introduction VNF industrial nanofiltration element main effect is the removal of organic matter, microbes, viruses, and most of the divalent metal ions and above, while retaining sodium, potassium, calcium and magnesium ions part, nanofiltration separation process no chemical reaction, without heating, no phase transition, does not destroy the biological activity, does not change the flavor, aroma, they have been more widely used in the preparation of drinking water and food, pharmaceutical, bio-engineering, pollution control and other industries The separation and concentration of the various purification processes. VNF1: Medium desalination rate, moderate calcium permeability, high TOC removal rate. VNF2: a high rejection rate for pesticides, herbicides, TOC and a transition metal having a good removal rate.