In order to research the purification effect on different nutrient sewage in summer environment, the paper used emergent aquatic plant Typha orientalis to purify the different concentration sewage water in outdoor. The static experiment result shows that concentration of test water is a positive correlativity with chlorophyll a and blue-green algae numbers. Meanwhile, removal efficiency of low concentration is the best, and the influent removal rates in ammonia nitrogen, TP and TN are 98.01%, 92.35% and 96.64% respectively.