the rapid development of China's economy in the process,but also to the environment caused by the tremendous pressure,and building energy consumption occupies a large proportion of.Therefore,how to reduce energy consumption,improve the source use efficiency of all walks of life to become research hotspot. Water supply and drainage as a major energy-the construction industry is an important project,should take effective measures to reduce energy consumption.In this paper,building water supply and drainage engineering energy saving technology in the use of a simple analysis