The construction speed is fast, which reduces the time of offshore operation and the interference to navigation channel, and avoids the environmental pollution caused by a large number of offshore machinery, equipment and personnel working at sea for a long time. Compared with the traditional replacement method, a large number of new energy-saving and environmental protection foundation reinforcement technology - compacted sand pile (SCP) technology is adopted, which greatly reduces the amount of excavation of submarine soft soil, and has obvious environmental protection advantages. By using chute riprap method, the precision of riprap is improved and the pollution of sea water is reduced. Grasp the law of tidal change, arrange the construction time reasonably, speed up the construction of sea water velocity, make full use of the function of tidal current, and minimize the concentration of water pollution