The experiment demonstration base was established in Wuliangsuhai Lake that is a typical macrophyte-dominated lake in China.In this base, the harvesting project experiments of submerged plant have been carrying out on a large-scale.The aim of those experiments is to search for a utility technology that can improve the environment of plant type eutrophic lake by harvesting submerged plant to transfer nitrogen and phosphor nutrients.The result of those experiments indicated that the planned and reasonable harvesting submerged plant can effectively cut back the accumulation and release of inner nutritious loads.At the same time, it also can make the lake environment achieve the balance between input and output nutrients and make the lake enter into good circulation gradually.Except of the above, it can7 t affect the reproduce of submerged plant and result in the blooming of algae.Therefore, the key problem that the ecological management technology may chronically and normally work can be resolved.The technology can be used to moderately control macrophyte-dominated eutrophic lake.Applying the technology make it possible to manage lake environment and continually utilize submerged plant resource simultaneously.