Silt easy occurs after foundation trench excavation,which affects the installation quality of the recast unit.Flow silt exists on the surface of the original mud surface near the west artificial island of Shenzhen—Zhongshan Bridge,so temporary silt-retaining structures should be installed on both sides of the sunken pipeline foundation trench.According to the analysis and comparison of the fabricated silt-retaining structure scheme of cylinder+fender+flexible inserted plate and the steel sheet pile,we know that the fabricated silt-retaining structure scheme has obvious advantages in construction difficulty and construction period,and give an introduction of the structure design and construction process of the fabricated mud retaining structure scheme,which is characterized by good stability,simple technological process and high assembling degree,and meets the requirements of the mud retaining function of the sink base. It may serve as reference for the construction projects of mud retaining of deepwater sunken pipeline foundation trench.