In recent years, with the continuous expansion and development of cities, water resources are becoming more and more scarce, and people pay more and more attention to recycled water. Wastewater reuse is an imperative energy saving measure. Technical and economic factors need to be taken into account when choosing the source of reclaimed water.In this paper, two commonly used reclaimed water sources, "reclaimed water" and "Rain Water", are compared and analyzed according to the "Hangzhou
... a Holiday World" project. To provide reference for similar projects. The main contents and conclusions are as follows:When using Rain Water reuse system, in order to meet the needs of waterscape water supply, Rain Water reservoir should be set at 1000m 3 , the initial investment is 200-3 million, and the water source is unstable, which increases the operating cost of the hotel and has low reliability. The occupation of water pool has many limitations, such as great influence on the building, and at the same time, it has the unfavorable factors of low economic benefit.Using the reclaimed water reuse system, the upfront investment is 1.3 million, and the daily maintenance cost is 1.27RMB / m 3 . Compared with Rain Water collection system, the reclaimed water treatment station occupies a small area, the investment cost is low, and because of the large amount of water that can be collected and utilized in the reclaimed water system, After deducting the cost of reclaimed water treatment, the annual savings can be about 316000 yuan, and the payback period of investment is 5 years.From the technical point of view, reclaimed water as a supplementary water source, in addition to solving the water scene reserve water source problem, but also can be used for garage flushing, commercial flushing and green irrigation and other uses, with the advantages of energy saving and environmental protection, good stability; Economically, the initial investment of Zhongshui is lower than that of Rain Water collection system, and the initial investment cost can be recovered in the short term, and it has long-term income. To sum up, reclaimed water is a very important source of water for this project, and it is suggested that the reclaimed water reuse system should be selected. As water resources become more and more tight, the price of tap water will become higher and higher, and the advantages of reclaimed water reuse system will become more and more obvious.