【正文】 st, main pipe circulation method and loop free system should better not be use in the new buildings’ centralized hot water supply system. According to Architectural Nature, architectural standards, regional economic conditions and the specific situation, branch pipe circulation or stand pipe circulation can be used to reduce even eliminate the waste of ineffectual cold water. IV. ADOPT WATERSAVING WATERDISPENSING FIXTURES AND SANITARY WARE A. Adopt watersaving waterdispensing fixtures. When hydraulic pressure is the same, the amount of saving water of Ceramic core watersaving taps and inflating taps, etc. is between 20% ~ 30%. The ceramic core watersaving tap not only has good sealing performance, there is nodrip after switch on and off tens of thousands of times, but also has significant watersaving effect. Especially when static pressure is higher and the water yield of ordinary tap is larger, the volume of saving water of watersaving taps is larger. Watersaving shower only need 9 L water every minute which can save half amount of water pared with ordinary shower. In public buildings the delayedselfclosing or photoelectriccontrol faucets and flush valve is used to avoid waste of water. Because the time of discharge of these sanitary appliances can be adjusted within a certain range. On the other hand, these sanitary appliances can operate by themselves to prevent spread of bacterium. B. Adopt watersaving sanitary ware The amount of water volume of the flushing toilet in residence occupies about 30% ~ 40% water volume of the whole day. In current toilet of residence, big and urination Share the same toilet stool and adopt the same flushing water, the flushes water volume is larger or equal 11L. Water consumption is large. This is obviously a waste. In addition to the toilet bowl whose volume of flushing water is less or equal 6L has been promoted to use, there is a kind of toilet stool which has two gears’ cistern [4]. The flushing water is 3L when flushing urination, while flushing water is 6L when flushing shit. V. PROMOTE THE UTILIZATION OF HIGHQUALITY PIPE AND VALVE Galvanized steel pipe has been widely used in drinking water supply system in the internal building as a water main pipe. However, corrosion of galvanized steel is easy to produce and breed bacteria, which can not only cause serious secondary pollution for water quality, but also the leakage of corrosion can lead to the waste of architectural environment and water resources. China39。 insist on the bination of watersaving and water resources’ development。 Wastewater Engineering Vol. 33 2020, . [3] Fu Wanxia. Zeng Xuehua. Discussion on Building Water Saving, Wateramp。 hydraulic valve is the upgrading products of float valves. In the same conditions, we should give priority to the selection of the better watersaving valves. VI. IMPROVE THE CURRENT CONSTRUCTION OF FIRE POOL According to the current code in our country, fire pool should be established when municipal water supply pipelines, water supply pipes or natural water cannot meet fire demand。 techniques. I. INTRODUCTION Water is a strategic resource which is related to human survival and development. The total water resources in our country ranks sixth in the world, but the per capita possession of water resources is only a quarter of world average. The distribution of water resources is extremely uneven in our country, and twothirds of cities nationwide have varying degrees water shortage. In recent years, city life suffers growing shortage of water resources and water pollution, which not only distress the people39。 perfecting hot water supply system and reducing ineffectual cold water。 Automation9780769542867/10 $ 169。 mercial residential district can save 7