Abstract: The underground parking lot of Qingmingshangheyuan in Kaifeng is located in weak soil layer with flourishing underground water table. After comparison of feasibility schemes, the composite soil nailing wall and cast-in-place piles are selected. Through stability analysis, the composite soil nailing wall and cast-in-place piles are satisfactory and feasible support system. Based on the examination report, the feasibility and effectiveness of the proposed scheme are validated.