Abstarct: The change in the earth's climate influenced by different pollutants, endanger human's life. Including major pollutants, water pollution that due to lack of fresh water, has a direct impact on the development of a country. So refining of polluted waters in the world is very important and imposes expensive to cities and countries. Therefore, choosing appropriate technology according to weather conditions, economic and social situation of each area is important. Natural methods to refine urban contaminated water by plant wetlands are an effective way to reclamation water pollution. In addition, this method has low cost, easy operating, low-tech requirements and low energy consumption compared to conventional refining method for removal of pollutants from water which leads to get better the environment too. For the sake of this an experiment was conducted on three plants elodea (egria densa), duck weed (lemna minor) and cattail (typha latifolia) with four treatments in three replications in a completely randomized factorial design in pilot experiments with batch. Treatments included effluent along with the plants, effluent diluted (dilution grade 1 / 2) with plants and control (no plant) in two cases (initial and diluted effluents). Parameters of nitrate, ammonium, organic nitrogen, total nitrogen, total dissolved phosphorus , EC and pH at the time of 8, 16 and 24 days in effluent samples and total nitrogen of plant tissue at the beginning and end of experimental period were measured. Parameters of BOD and COD in samples of effluent with typha latifolia at the times mentioned also were determined. Results of this experiment showed that the concentrations of nitrate, organic nitrogen, and total nitrogen in plant treatments were significantly lower than treatments without plants and elodea treatment had highest efficiency in reducing the above parameters. The highest total N uptake was found in lemna minor plant, too. Also, the results of the effect of treatments in reducing total dissolved phosphorus concentration showed treatment of lemna minor plant was significantly more effective than the other treatments. There was no significant difference in EC and pH values of the treatments, only EC in the treatment of lemna minor plant decreased slightly when compared to the control. The effect of the typha latifolia on the concentrations of COD and BOD showed this plant decreased only BOD in the second trend time of initial effluent. It is concluded that lemna minor is more effective in the removal of nitrogen from the effluent than the other plants.