As a new kind of separation technology,the nanofiltration can reclaim the useful substance while treating the waste-water.It is applied widely in the industrial wastewater treatment.It focuses on application of nanofiltration membrane to printing and dying wastewater,foodstuff waste--water,heavy metal waste,petrochemical wastewater,pulp and paper industrial wastewater,chemical wastewater,radioactive contaminated wastewater and so on.