Abstract: With water culture experiments, the growth character of Carex dispalata and the purification effects of TN、NH3-N、TP、CODCr in three types of sewage (low concentration, medium concentration and hingh concentration) were studied. The results indicated that Carex dispalata grew best in the medium concentration sewage , The biomass of Carex dispalata in the medium concentration sewage was significant higher than in the low concentration treatment（p <0.05）and no significant little higher than in the high concentration treatment. The purification effects of Carex dispalata in three concentration treatments were significant better than the contrast treatments. In the three concentration treatments (low, medium, high), the removal rates of TN were 87.04％, 88.84％ and 68.87％, respectively. The removal rates of NH3-N in three concentration treatments were 96.70％, 98.81％ and 98.68％, respectively. The removal rates of TP were 94.48％, 96.98％ and 96.75％, respectively, and CODCr were 63.20％，83.80％ and 82.33％, respectively. The removal rates of NH3-N, TP and CODCr in medium and high concentration treatment were all significant higher than in the low concentration sewage（p <0.05）, the removal rates of NH3-N and TP in medium and high concentration treatment both reached more than 95%. The removal rates of TN in medium and low concentration sewages were significant higher than in the high concentration sewage（p <0.05）, no significant differences were showed between medium and low concentration sewage. The experiment showed that TN、TP、CODCr fell quickly in the early days of the experiment. The study showed that Carex dispalata could purify sewage well, it can be used as restore plant in the remediation of sewage.