There are many difficulties in the construction of deep foundation pit support system. In the complex formations, the suitable construction scheme should be selected flexibly according to the actual situation on site. Quicksand stratum was encountered in a foundation pit supporting construction in Taiyuan, the extended end anchorage cable took was used in stead of the conventional anchor cable, and groundwater and sand inflow were effectively controlled. The combined use of conventional anchor cable and the extended end anchorage cable has remarkable effect, which ensures the safety of supporting and retaining structure, reduces the influence on adjacent buildings and reduces the cost of foundation pit support.