The achievements can be generalized as follows. (1) The monitoring and study of Taihu lake eutrophication recorded the process of ecological environment evolution under the intense impact of mankind activities. .This has promoted the protection and control of Taihu lake and the ecological environment and also provided the basic data for the management and govern of Taihu lake. (2) The physical-ecological experiment projects have succeeded in killing algae and improving water quality in Meiliang bay, Wuli bay and Mochouhu lake. The projects restored aquatic vegetation in experiment region, reduced the 59% algae, reduced the production cost and improved the drinking water quality. This technique has been expanded to other areas by SEPA. (3) The biogeochemical cycle of nutrients such as nitrogen and phosphorus, the effects of hydrological and physical elements on water environment quality and blue algae bloom. The study has preliminarily expounded the rule of distribution and current features of wind current established substance transfer model and ecological model of water environment of Taihu lake, revealed the effects of the hydrological process on water quality, structure of ecosystem and blue algae bloom, expounded the mechanism of blue algae bloom, and set up model of blue algae bloom (4) The construction programme of wetland reserve and natural reserve in Hongzehu lake, the programme of ecological environment protection in Changdanghu lake, and the programme of eutrophication control in the lakes locating in southern Jiangsu province promoted the ecological environment protection. These studies provided theory and practical basis for lake protection and promoted the sustainable use of lake resources. (5) The study of Guchenghu lake ecological environment and fishery development technique promoted the restructuring of fishery and the improvement of economic efficiency, solved the actual problem of lake fishery production. The economic benefit was acquired. (6) The study of sediment dredging and disposal of sediment, the study of nutrient release at water-sediment surface and internal loading control have preliminarily revealed the release process of nutrient from sediment, the relation between nutrient release and hydrology, which deepened comprehension of the second pollution and provided the theory instruction for sediment dredging. (7) The relationship between wind force and sediment resuspension in Lake Taihu has been set up; the effects of redox potential on the geochemical behaviors of nutritive elements at the interface between sediment and overlying water has been studied; the key factors affecting the internal loading of nutrients and the changeover between source and sink of sediments, as well as its threshold values, has been discussed. Interfacial activation of nutrients in sediments has been simulated in Lake Wuli both at the dredged area and at the un-dredged area. These studies are important to accurately calculate the internal loading of nutrients in the shallow lakes in the middle and lower reaches of the Yangtze River, they are also useful for establishing the parameters of ecological dredging and forecasting the effect of dredging on the water-quality improvement. (8) Exploitation of Lake Resources. According to the study of shallow lake ecology, fenced cultivationand plantation without soil were creatively developed by applying biology to control waves. According to the study of the effect of fenced cultivation on environment, the ecological fishery projects were designed to improve economic efficiency and water product quality. Study achievements above were acquired to provide theory basis, project measures and techniques. At the same time, more than 120 papers were delivered (including 12 papers embodied by Sci), 3 books and 5 data books were published