The water exchange in the dug-in harbor basin is slow,and eutrophication pollution often occurs,which affects the normal operation and green development of the port.Based on the analysis of the causes and characteristics of water eutrophication in the dig-in harbor basin,we propose an ecological floating island technology which takes the effects of both water treatment and landscape into account,and analyze the effects of ecological floating island technology based on an inland harbor basin.The results show that the reasonable allocation of ecological floating islands can effectively control the eutrophication of water,improve the water quality and create a green landscape of the harbor basin,and it may serve as reference for the eutrophication treatment of inland river dig-in harbor basin.