Huaihe River Sea-entering Channel is a strategic backbone project, which expands the Huaihe River flood way out, improves the Hongze Lake flood control standard, ensures the safety of 20 x 10(7) people and 30 x 10(7) mu arable land. Environmental impact assessment system is carried out in engineering construction, and the "three simultaneous" management system - simultaneous design, construction, and use, is taken for environmental protection. Optimal scheme is confirmed in the early planning stage; in the construction stage, environmental protection problems are managed strictly by construction. management department, construction units and supervising unit; in trial operation phase, levee and beach farmland ecological environment have been restored and soil conservation measures are implemented; land utilization is controlled strictly by using non-cultivated land and accounting for less fertile farmland during the resettlement. 4. 117 x 10(9) yuan has been invested recently in Huaihe River Sea-entering Channel project, and 2. 17 x 10(8) yuan, accounting for 5.4% of the total investment, is invested in environmental protection. The project passed the water acceptance and was put into use in May of 2003. In 2006 it passed the final acceptance of construction. The project has discharged 7.7 x 10(8) m(3) during the experience of two Huaihe River flood in 2003 and 2007, which plays a key role in valley security and regional development. The project with a novel architectural style, a beautiful environment and convenient transportation is becoming a water conservancy tourism projects consisted of engineering landscape, natural scenery, garden art, popular science training and entertainment, according to the purpose of green water conservancy and ecological water conservancy during the construction and operation management.