The traditional stacking materials with direct drainage vacuum preloading face the problems of high energy consumption, ecological environment damage and potential pollution, high costs, limited transportation of stacking materials, and a long construction period. To solve these problems, this paper adopts the method of direct drainage vacuum preloading combined with water bag stacking for the monitoring and detection tests on site. The measured total settlement, residual settlement, degree of consolidation, settlement rate, pore water pressure, and other indicators meet the design requirements. The results show that vacuum preloading combined with water bag stacking has the advantages of simple construction processes, environmental protection, safe and reliable performance, a short construction period, and low costs. It has achieved good economic and social benefits, which is of great significance and value for promoting the development and progress of soft foundation treatment.