A project with 500m3·d-1 for treating electrolytic manganese wastewater was studied. Combined membrane processes, including microfiltration, two steps of nanofiltration and reverse osmosis were used.  The flux, retention rate rate and concentration ratio were investigated. During the period from 2010.5 to 2012.5, the membrane flux declined over time. The first stage nanofiltration membrane flux fell the most serious, about 16%, but after chemical cleaning, it can be restored to the 90% of the initial data. The interception rates of membrane groups were stable during the time.  Mn2+ retention rate of nanofiltration system  was more than 90%, while retention rate for SO42- was about 80%, but the effect for ammonium ion  was poor. Ammonium ion rejection rate of the reverse osmosis system   meant up to 91.6%. The concentration multiples of the manganese ion of the nanofiltration system can be remained at about 8 in small pressure range. The final drainage meet the first class discharge standard of "integrated wastewater discharge standard" (GB8978-1996). Consequently, the system can meet the needs of electrolytic manganese wastewater resources recycling and discharge standards.