Taihu lake basin is an phialiform area of lower area in center with higher around.Due to the effect of tide, the difficulty of driainage may arise.With the high development of economy recent years, the mode of land utilization chagned accordingly.This affects the flood disaster signally.In this article, through the comparison and analysis of some aspects including rain-storm, drowned area, flood level and regulation capacities in 1954, 1991 and 1999 in Taihu Lake basin, some countermeasures on flood control are put forward.