This paper mainly deals with the effect of the alga blooming controlled in the restoration zone covered by aquatic plants in the northeast of Dianchi Lake.The restoration mainly combined with the communities of Typha orientalis Presl., Typha angustifolia L.Zizania latifolia Turcz,, Phragmitis communis Trin,, P.malaianus Miq., and Myriophyllum spicatum L.Comparing the concentration of Chi.a of the restoration zone with the control's,the process of the changing of the alga with the enclosing test was analyzed.The result showed that the restoration zone had a high efficiency of algae enriching.The concentration of Chi.a in the side of the zone was about as 29 times as the control during the alga blooming.In certain time (from Jul.to Oct., 2003), the efficiency of the treatment for the concentration of Chi.a can be more than 90%.From the research, we found that the decomposing process of the alga during the alga blooming accord with the kinetic equation of the first grade with the coefficient k=0.2173, and the ability of the treatment for the alga can get 3.7kg/m³ in the restoration zone.At the same time, the efficiency of shading light of the emergent plant in the restoration zone can be more than 90%, and the photosynthesis rate of the alga also decreased about 60%.