This paper mainly introduces a new construction technology suitable for dredging construction of dredging dredger, namely dynamic delamination and depth determination technology. Firstly, sensitivity factor analysis is used to sort the importance of each factor affecting the trimming time of dredging engineering, and then the mechanism of each factor's influence on the smoothness is analyzed one by one. Finally, the calculation formula of dynamic stratified depth determination is constructed according to the analysis results, which can be used to calculate the different depth settings for phased construction. The whole process is to strengthen the stage control of the flatness in the construction process, so as to reduce or even eliminate the late trimming time, reduce the corrugation caused by the early stage of the project, and ultimately reduce the construction period and improve the project income. This paper also shows the feasibility and advantages of this construction technology through its application in Yangshan Phase 4 infrastructure project.