Abstract:In order to study the rationality of the domestic large thermal power and water-cooling unit water use index, put forward further to save water, reduce the possibility of water consumption index of power plant, this article through to the domestic large thermal power water balance of the unit, water distribution and water process of the preliminary analysis and research, the current situation of water of the domestic large and medium-sized thermal power water-cooling unit, a preliminary conclusion: large and medium-sized thermal power raw concentrate rate of the unit under the premise of meet the rules of national standards shall be an economic rate, the local water resources, local environmental requirements and the economy of circulating water treatment are closely related and should be optimized. In different regions, there should be differences in the requirements of water consumption indicators for thermal power units in different regions, and should not be a national standard. The specific thermal power project needs to analyze the rationality of its water consumption index, so as to propose relatively reasonable water-saving space and reduce the possibility of water consumption index. The decrease of water consumption of the circulating water-cooling unit is the limit, and it is not advisable to pursue the water consumption index of water-cooling unit.