Based on soil water-sensitive particularity in expansive soil area, basic farm field construction in this kind of areas should adopt an opposite direction slope terrace.It regards as the guide thought of terraced design in the expansive soil region to drain water for stabilization terraced bank,lay equal stress on slope engineering and plant measures.Combining the practical experiences of field investigation,the specific problems of the earth-banked terrace specifications,size and structure ect.are further expounded.