The biological abundance, natural beaty, coast productivity and physical characteristics of lakes have constituted habitat prefered by the people firstly. It is known that, technologic developments destroyed to ecosystem in this area and this is very harmful. To be seen as pour region of agriculture-settlement areas of lakes and negative intervenes of people to ecosystem is caused anxieties forming on constituousness of our natural areas. Lake Eğirdir is the second large freshwater lake, which is tectonic origin and 917,7meters altitude from sea. Ecological structure of the lake has been affected by the 81 settlement in surrounding area. In this study, it was aimed to determine, solution suggestions related protection of Eğirdir Lake's structure. Also, for the last fifty years, the people have been continued wrong intervenes to Lake Eğirdir and this position has been caused negative results. Another goal of this study was to determine of these negative results and to bring solution suggestions. Observations and researches made in Lake Eğirdir and its enviroment have been supported by related literature and studies. Drinking water requirement of İsparta and surrounding area is provided by Lake Eğirdir, inside of continent reservuor area.