To ensure smooth implementation of the project and control the content of fine sand particles to less than 20%,the standard SPT was adopted prior to construction and during construction.The soil type and fine particle content are studied.At the same time,through the actual dredging efficiency analysis of the dredger on site,the relationship between SPT standard penetration number and dredging capacity of different types of dredgers is obtained as follows:when value N is greater than 30,it is difficult to excavate,and necessary to introduce the large cutter suction dredger or trailing suction hopper dredger.For the same-quality soil,the content of fine blower filler material by the trailing suction hopper dredger is far lower than that by the cutter suction dredger.Therefore,according to the SPT drilling data,it is of great significance to arrange the construction vessel and construction technology reasonably for the progress of project implementation and cost saving.