In the history，Beijing artificial river，natural river channel，provides considerable rain implicative and bear ability.Along with the accelerated urbanization process，the Beijing hard cover，different location drainage ability differ in thousands ways，combined with highly concentrated population resources，flood disasters and secondary disasters throughout the collision，triggered a series of “domino effect”.From these mistakes.Must restore the sponge functions of urban land，the construction environment beautification and the accumulation rainwater and good park，large-scale afforestation，go “accumulation and drainage，and resistance to flooding with rain water recycle，urban management and beautify their homes，” a new type of water conservancy