Abstract: The effect of hydroponic Allium ascalonicum L.on the nutrient reduction and reclamation of wastewater was studied in this paper. The results show that the rates of the removed total nitrogen and total phos phorus are 98.5% and 94.85%, respectively, in A. ascalonicum treatments, and 76.44% and 52.96%, respectively, in controls. During the growth period 11.51g/m² nitrogen and 4.60g/m² phosphorus is uptaken by A. ascalonicum L. , and its yield is 64.9t/hm². The result indicates that shallot not only can purify wastewater effectively, but also has obvious good economic value.