Abstract: Based on the unloading experiments and according to the extreme depth affected by unloading in the direct shear tests,the strong rebound depth in the conventional consolidation tests and the large depth with varying lateral pressures in K0 consolidation tests,the proper stabilization depth of soil in passive area of foundation pits was put forward,and was verified through calculation and engineering practice.The obtained results were valuable to the reference for engineering design of stabilization affected by unloading.