The northeast edge of Wan HaoSubstation of the State Grid,considering theLi Cheng S Engineering is adjacent to Hedong 110 kVcomplexity of surrounding environment and the safety andeconomic of the support engineering,the supporting scheme was computed by using the subsectionmethod and 1izheng deep foundation pit software.The edge of jsegment pit,which is 2.0 metersaway from the substation,is sensitive to soil deformation,the narrow space can not stepslope excavate,and soil nailing wall can not meet the security requirements of the lateral wall,thus,the pileanchor retaining structure is selected;the surroundings of B segment are roads and extensive spaces,the stepslope bility of the pile soil nailing wall supporting structure is adopted.The results show that,the global staanchor retaining segment like local and various parameters such as antioverturning and resistant heave;and the parameterstensile and internal and external stability of the stepslope soil nailing wall supporting segment all meet the requirements of specifications,the whole designschemes is feasible.reasonable andeconomic.