Aquatic ecosystem restoration is a wide-used term at present, and it lias gradually aroused the attention of the public and government due to serious environniental problem of lake in China.In fact, as a systematic work, ecosystem restoration makes the ecosystem towards the good state or prestine status.It comes true through the decreasing or amelioration of environmental press combining with single or multi introduced measures of plants and animals.At present, lake ecosystem restoration is usually considered as simple planting grass and cultivating fish etc.or explained as the man-made re-arrangement or incrustation of biocommunity.Tliese bias in cognition result in less successful examples during the long time of the ecosystem restoration practices.Here we put forward an alternative technological way to purify the lake water in part area of Lake Taihu through ecosystem restoration, including three mutual-connected phases, viz,improving the lake condition→ restorating aquatic macrophyte →ecosystem trarisformating from to grass-typed lake →improving water quality.Whether this idea directing the restoration of aquatic macrophyte and lake ecosystem is successful will be tested by future practice.