For the landslide pier redevelopment project, we shall at first carry out the ground treatment to the slope behind the pier based on the analysis of soil landslide; then confirm the boundary condition of engineering design, including variation of water depth and the distribution of obstacles by submarine topography, determination of the reasonable soil parameters, as well as typical submarine detection and salvage scheme; and finally choose gravel pile strengthening scheme for slope foundation, steel pipe pile for redevelopment pier, and evade the primary pile. The results show that the scheme is feasible, which can provide reference for the construction of similar projects and the old pier transform.