Analyzed the water quality in Lake Luoma, the results indicate that its major contaminants are TN (total nitrogen), TP (total phosphorus) and volatile phenol. Based on the parameters of Chemical Oxygen Demand, Dissolved Oxygen and Chlorophyll a, the comprehensive trophic state index method are applied for assessing the eutrophication of Lake Luoma, and the results confirm that its water quality is heavy eutrophic. The water quality of Lake Luoma meets the level of Ⅳ to Ⅴ classification of surface water environmental quality standards. The nitrogen in the lake is sufficient, and the growth of algae is controlled by the phosphorus. Water eutrophication of the lake is phosphorus-controlled.