It is an extremely urgent task to restore Taihu Lake from pollution and eutrophication.Control of external pollutant source is surely the most fundamental way, but it is far from enough to restore the lake in a few years.For such a reason, more efficient measures should be adopted in the lake.In this paper, the main factors to delay the restoration process were discussed on limnological bases.Blue-green algal bloom disaster, urban water source pollution, serious water and environmental pollution in some lake areas were taken as the main problems.Possible approaches of both long-term effect and forthwith effect to the restoration of the lake were suggested.