According to the analysis on basin，regional and urban flood control projects in Taihu basin, the basin flood control system mainly consist of 11 key engineerings and its function is to ensure safety of Taihu basin under the design flood conditions. The critical value of flood loss to equal 0. 2%-0. 3% GDP of the basin is regard as a index judging and controlling basin flood disaster. Based the meaning of flood control standards for Taihu basin,relationship between space-time distributing of design storm and planning of the flood control system are analysed. Lastly, the practical flood control standards of the basin is discuss and some suggestions are put forwarded to increase basin flood control capacity.