At present, the evaluation of the dredging effect of the drag suction dredger mainly relies on the common sense experience of the construction personnel, such as sacrificing a large amount of construction time in exchange for maximizing the yield of sand, but it causes a higher cost of single earthwork.Combined with the measured construction data of the trailing suction dredger in Xiamen Port, a multi-index dredging performance evaluation system is constructed, and the weight of each performance index is determined using the entropy method.The research shows that the multi-index evaluation system can more comprehensively and objectively reflect the dredging performance of the drag suction dredger, and it is consistent with the test results of the auxiliary decision-making system of the dredger.