In view of the problems of low efficiency and poor adaptability in the actual construction of “Xinhaima” ship，we compare and select the performance parameters of dredge pumps of the same ship type，optimize the impeller design of dredge pump，apply the dredge pump scheme of smaller impeller diameter and higher rotation speed with the characteristics of wide blade wall width，wide spherical area and etc，and analyze the engineering application effect of dredge pump. The results show that the high efficiency dredge pump can expand the applicability of the ship，improve the efficiency of dredging and bow blowing，and reduce the energy consumption of the ship，which can provide the references for the dredge pump selection of trailing suction hopper dredger.