In order to reduce the cost of maintenance dredging and improve the navigational efficiency of ships,we take the fluid mud in the harbor area of Binhai Port in Yancheng as the research object,and conduct a study on the seaworthy density of fluid mud in Binhai Port on the basis of characteristics of fluid mud.We carry out the thickness distribution of fluid mud,sediment particle size analysis,and rheological characteristic test at shallow points along the wharf front after dredging in the harbor pool and channel area to study the characteristics of fluid mud,and then combine the relationship between the mucous content of fluid mud and the seaworthy density,the rheological characteristic test,and the theory of laminar-turbulent flow transition together to determine the seaworthy density of fluid mud in the harbor area of Binhai Port.The results show that the average thickness of fluid mud in the harbor area of Binhai Harbor is 1.71 m,and the sediments are mostly dominated by viscous fine particles,with median particle sizes ranging from 0.006 to 0.008 mm,and the content of viscous particles is more than 90%,which is in line with the condition of utilizing the seaworthy water depth.It is determined that the standard value of density of the seaworthy fluid mud in the harbor area of Binhai Port is from 1,200 to 1,240 kg/m3.