Abstract: In order to solve the pile foundation, foundation pit, basement structural engineering construction on the deep silt layer, through the comparison of many programs, the adoption of solidified silt form hardening cushion and gravity retaining wall, to solve the construction machinery walking, foundation pit support, water stop, foundation pit excavation, structural cushion bearing capacity and other problems.Solidified silt soil can obtain high foundation bearing capacity, and can be used for similar projects to obtain significant economic benefits and accelerate construction progress significantly.