Abstract: The characteristics and effects reducing nitrogen and phosphorus of lakeside ecological restoration engineering were explored in this study based on the varieties of environmental conditions and N and P output intensities among the lakeside zones of Chaohu Lake. To detect the difference of N and P reduction between the periods of heavy rain and rainstorm interval, we chose 4 typical sections of ecological restoration area and native shrub grass area in the northwest lakefront of Chaohu Lake. The result showed that section 2 and section 3 had obvious effect on N and P removal. During the heavy rain, the removal efficiency of N and P in section 2 were 69% and 60% and they were 60% and 58% in section 3 respectively;During the rainstorm interval, concentrations of N and P decreased 67% and 63% respectively in section 2 and 59% and 51% in section 3;The effect reducing N and P of ecological restoration engineering was significantly related with the concentrations of N and P in the rainstorm runoff;The section 2 had the best effect on reducing N and P.

Key words: Chaohu Lake, ecological restoration engineering, storm runoff, reduction of nitrogen and phosphorus