This article is based on the engineering practice of deep muddy soft soil layers in the Wenzhou area， and proposes a series of improved and optimized measures to address the problems of difficult alignment of pile drivers， insufficient accuracy of steel insertion， and high construction costs in SMW pile construction. By improving the method of aligning the displacement of the pile driver with the insertion of the steel， and utilizing the relative displacement and markers between the track shoe and the retaining cover plate， the pile driver was quickly and accurately positioned. The insertion method of steel sections has been optimized by using a combination of pile driver auxiliary crane and excavator light pressure， which reduces the construction costs and improves the efficiency. In addition， by setting up steel guide locators and bearing type guide devices， the verticality and center position of steel insertion have been effectively controlled. Practice has shown that the improved construction method significantly improves the construction efficiency （from 22~25 pieces/day to 38~40 pieces/day）， reduces the machinery and labor costs， and minimizes the impact of noise and vibration on the surrounding environment. The research results provide practical and feasible technical references for the construction of SMW method piles in silty soft soil layers.