In a series of field investigations and plant samplings around an electroplating factory in Guangxi Province, a hygrophyte with chromium hyper-accumulative properties, Leersia Hexandra Swartz, was found for the first time in china. Leersia Hexandra Swartz is a perennial species that often grows along the margins of the tailing pond of the electroplating factory and the nearby streams. It grows to about 1m tall but when floating, it may have branches several meters long. Further research indicated that the hygrophyte from the tailing pond was obviously characterized by the chromium enrichment in its leaves, with a mean Cr concentration of 1786.9mg/kg (1084.2～2977.7mg/kg). Its rootstalks had an average Cr concentration of 236.6mg/kg (135.2～386.1mg/kg), whereas the Cr concentrations in the silt and water of the pond were determined to be 114.3mg/kg and 5.90mg/L, respectively. The highest ratio of Cr concentration in its leaves to that in soil around its roots was 56.83, the highest ratio of Cr concentration in its leaves to that in its roots was 11.59 and the highest ratio of Cr concentration in its leaves to that in water was 517.86. The results indicated that Leersia Hexandra Swartz could significantly absorb chromium from the silt and water and enrich its leaves, stems and roots. In addition to its Cr hyper-accumulator characteristics, Leersia Hexandra Swartz is known to grow quickly, to be highly adaptable and is found over a wide geographical area. Therefore, this hygrophyte shows potential as a very successful phytoremedy in treating Cr-contaminated soil and water. Furthermore, its discovery provides a new plant for the investigation of the Cr hyper-accumulation mechanism.