Abstract: Due to its high compressibility, low permeability and low consolidation property, the treatment of ultra-soft soil is very difficult, and the common method is hardly effective. For the ultra-soft soil in Tianjin Port, the design method and construction technique are clarified. According to the indoor experiments and in-situ inspection, the physical, deformation, consolidation and strength properties of ultra-soft soil at different stages are analyzed. The results show that the ultra-soft ground after reinforcement can satisfy the engineering requirements, which can be referred for the similar projects.