Honghu Lake is the seventh largest freshwater lake in China and located in the Jianghan Lakes which is in the middle reaches of the Yangtze River. It is taking an important mission of water suppply, .flood stoarge and drainage, pollution self-purification, agricultural and fishery production, and is also a carrier of shiping and tourism. After a number of changes in the history, Honghu Lake shows its ecological complexity and diversity among the similar lakes. This thesis explains the formation and environmetal evolution of Honghu Lake, and sum...