Constructed wetlands are considered as sustainable systems to treat various contaminants wastewater depending on the structure and bacterial functions. This research investigated the identity of bacterial species that exist in constructed wetland and their ability to remove saline and pollutants. Horizontal wetland system constructed receiving an artificial salinity polluted water. Evaluation of salinized and polluted water done physically and chemically. Isolate and identify bacterial species by morphological and chemical analysis and confirmed by 16SrDNA test, and phylogenetic tree structured to reveal relationship among the bacterial species Results showed pH ranged 6.4 and temperature 18 o C, whereas values of EC, TDS decreased (from 5.5 to 1.18 µS/cm) , (from 1036 to 750 mg/L), respectively, in 12 hours. Concentrations of other pollutants were were also dropped for PO4 to 1.2 mg/L and for NO3 to 2.2 mg/L. Efficiency removal of heavy metals were 100% for Cd and Ni, and ranged between (38-66%) for Pb and Zn. Analysis of 16SrDNArevealed various bacterial genera such as Enterobacter, Stutzerimonas, Stenotrophomonas, Areomonas and Pseudomonas that showed strong positive statistical correlation with removal of pollutants and salinity such as TDS , heavy metals and nutrients like PO4 and NO3. These results declared that each genus has special functional role to remove or eliminate contaminants in constructed wetland. So, it can be concluded that wetlands are mainly directed by bacterial community that have special connections and interactive network. Therefore, further investigations are required to understand the dynamic and metabolic pathway for that community.