Good mechanical strength, high water flux and salt rejection, and highly chlorine-tolerant property are essential for nanofiltration (NF) membrane. To achieve these properties, polyethersulfone (PES) NF thin-film composite (TFC) membrane was prepared via interfacial polymerization using piperazine (PIP) and 2,2'-bis(1-hydroxy1-1trifluoromethyl-2,2,2-triflutoethyl)-4,4'-methylenedianiline (BHTTM) as aqueous monomers, trimesoyl chloride (TMC) as organic monomers, and PES three-channel capillary ultrafiltration (UF) membrane as substrate. The prepared NF membrane displays pure water flux of 36.1 L m(-2) h(-1) and Na2SO4 rejection of 96.8% at 4 bar. NaClO solution was used to treat NF membranes for the evaluation of NF membrane chlorine-tolerant property. The effects of NaClO concentration, contact time and operating pressure on the chlorine -tolerant property of NF membrane have been thoroughly investigated. Particularly, the durability of NF membrane versus CI was tested though long-term test. The pure water flux and Na2SO4 rejection of NF membrane after 5000 ppm-h NaClO immersion was 43.4 L m(-2) h(-1) and 99.8% at 4 bar, respectively. The fabricated NF membrane could tolerant 13000 ppm-h Cl under 4 bar, and the water flux and Na2SO4 rejection are maintain at 51.6 L m(-2) h(-1) and 99.6% during NF running process, respectively. Moreover, NF membrane exhibits 3.84x10(5) ppm-h chlorine tolerant at 0 bar. These results indicated that the fabricated PES three-channel capillary NF membrane could be applied to practical process of desalination or water softening.