In Hubei province

the soil eroded to inner-city is coupling with formidable soil erosion to backg round in the spatial phase

and they form overlying effect together.Integral structure of soil erosion landscape ecosystem is unbalanced in spatial owing to the differences of the climate

geology

geomorphy in Hubei province.In microscale

the Yangtze river and Jianghan plain are the center of sediment and transporting sand

the currents of soil are assemble successively from north

south to the center section

and from west to east walking through center axes.The spatial structure pattern is unsymmet rical block-ring model.The soil erosion to inner-city is come into being of both social and natural factor.