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The rapid development of the housing industry has driven the construction of water-themed residential areas. Water-themed residential areas are becoming a focus of attention in the market and society. However, due to the increasing strain on water resources, worsening water pollution, declining water quality, and disrupted water cycles, how to maintain the sustainable development of the water environment in residential areas has become an urgent issue that needs to be addressed. : Sustainable Development ； Water environment in residential areas ； Water feature design ； Ecology: With the rapid development of the housing industry, the construction of waterscape residences has accelerated, and it has become a focus of attention for both the market and society as a whole. On the other hand, given the problems of increasing water shortages, worsening water pollution, declining water quality, disrupted water circulation, and neglect of the physical environment in residential areas, it has become extremely urgent to ensure the sustainable development of the water environment in such areas. : Sustainable development; Water environment in residential areas ； Waterscape design; ecology: The concept of sustainable development has been gradually developed as human awareness of the ecological environment has increased, as well as through the connections between people and between humans and nature. Sustainable development refers to development that meets the needs of the present generation without compromising the ability of future generations to meet their own needs. To achieve sustainability in the urban environment, it is necessary to manage the urban water environment. The sustainability of water environments is one of the important aspects of sustainable urban development. Firstly, water is the source of life; the sustainable development of water environments directly affects human living conditions as well as human health ； Secondly, the economic development of cities also relies on a healthy water environment; only through coordinated development of both can true sustainable development be achieved ； Furthermore, the water environment is an integral part of the natural environment and an important component of the ecological environment. The sustainability of water environments is also an important foundation for ensuring the ecological environment. The water environment in residential areas is a part of the urban water environment. Water bodies in residential areas, while forming part of the aquatic ecosystem of those areas, should make full use of various water feature treatment techniques to improve the environment, purify water artificially, collect rainwater, and replenish groundwater. In addition to the functions mentioned above, water bodies also play a role in improving the regional microclimate. In the sustainable design of water environments in residential areas, it is first necessary to have a macro-ecological awareness of the city, considering its overall ecological balance and development, and even from a broader regional perspective. On this basis, sustainable design is then carried out with the aim of optimizing the water environment in residential areas. 1. To design green water features that are in line with the principles of sustainable development, it is necessary to have a basic understanding of the design forms of water landscapes: first of all, the planar shape of water bodies can be divided into geometric shapes and irregular shapes. Water features in Western classical gardens often take geometric shapes, and this style is also commonly used in modern environments. The water surfaces are usually not large and are created artificially. Geometric composition uses shapes such as circles and squares as basic elements, which are combined in various ways to create diverse forms and produce a strong visual effect. Chinese classical gardens emphasize nature; when it comes to water management, natural and irregular water shapes are preferred, with the shores of the water bodies following natural curves as they wind their way through the architectural landscape. In the design of water features in modern living environments, there is an increasing emphasis on creating natural, green, ecological settings, and irregular shapes are increasingly used for these water features. Of course, the use of various planar forms in modern landscape design is not fixed; various expression methods can be employed depending on the theme of the environment. Secondly, in the design, water features are divided into moving water and still water by controlling the movement of the water. Thus reflecting the different temperaments of the environment. Dynamic or static water bodies are used according to the spatial requirements of different functions. In areas with high foot traffic, dynamic water features should be appropriately used to liven up the atmosphere. However, in areas surrounding residences or in private or semi-private spaces, water features should avoid causing noise pollution to the residential area due to chaotic water sounds; therefore, static water scenes can create a more peaceful and serene atmosphere. 2. When designing water features in residential areas, the following 3 basic requirements should be taken into account: (1) Meeting functional requirements. The basic function of a water feature is to serve as an object of appreciation; therefore, it must be able to bring aesthetic pleasure to people, making them enjoy the view. Thus, the design must first satisfy artistic aesthetic standards. Water features also serve purposes such as swimming, entertainment, and fitness. With the use of water features in residential areas, people are no longer satisfied merely with visual appeal; what they seek more is the experience of being in contact with water and playing in it. Therefore, the design includes various water play fountains, walking streams, children’s swimming pools, as well as various hydro-massage pools and bubble baths, thereby combining landscape water bodies with those designed for water play, entertainment, and fitness, and enhancing the functional versatility of the landscape. Water features have the function of regulating the microclimate. Streams, artificial lakes, and various fountains all help to reduce dust, purify the air, and regulate humidity. In particular, they increase the concentration of negative oxygen ions in the environment, which helps to improve people’s mood and has certain health benefits. The larger the surface area where water comes into contact with air, the smaller the droplets produced by the spray, the more effective the air purification, and the more negative ions are generated. The aforementioned functions can be considered as appropriate in the design to optimize the solution. (2) Requirements for environmental integrity: Water features are products that combine engineering technology with artistic design; they can be standalone works. However, a good water feature must be designed in accordance with the surrounding environment and architectural functional requirements, and it must also be in harmony with the style of architectural and landscape design. There are many forms of water features, such as flowing water, falling water, still water, **etc.**, and thanks to the various types of nozzles, different **effects** can be created. Even for the same type of water feature, different power pumps can result in water currents of varying sizes, heights, and speeds. Therefore, in the design process, it is necessary to first study the elements of the environment in order to determine the form, shape, planar and three-dimensional scales of the water feature, thereby achieving harmony with the surrounding environment and establishing a balanced relationship between various elements. This helps to create a rich variety of elements such as main features, secondary features, near-view elements, and far-view elements. Only in this way can a good water feature design be created. (3) Economic efficiency of operation: In the overall design, it is necessary to consider not only the optimal performance but also the economic efficiency of system operation. Different landscape water bodies, different shapes, and different water dynamics result in varying energy consumption requirements; in other words, the operational economy varies. Operating costs can be reduced through measures such as optimizing combinations and pairings, combining movement with stillness, and grouping by function. For example, by designing it in functional groups and running them separately, operating costs can be saved. Normally, some simple functions are used to achieve the desired landscaping effects, with very low operating costs ； During holidays or when there are celebrations, other landscaping functions can be activated in groups, thereby achieving certain operational efficiency. 3. In recent years, with the rapid development of the residential construction sector in our country, water features have become an important part of architectural landscape design. In environmental design, from residential communities to urban plazas, there is an increasing use of water bodies and water features; as a result, a large number of water-friendly residences and fountains in plaza settings have emerged. However, the current state of the water features is concerning. Many cities still have many unsatisfactory and unreasonable issues in their water feature design. Compared to the south, the northern regions are particularly severe. The northern part of our country suffers from widespread drought and water shortages. Some cities, ignoring these objective conditions, recklessly build large-scale **pools and create large-scale landscapes that become unusable in winter, resulting in waste of space and equipment; some of these **facilities are covered in rust and in a messy state ； Some ponds are filled with debris that is difficult to clean, and such water features not only fail to beautify the environment but actually damage it. It is precisely because of these issues associated with water features that designers need to take into account the conditions of local water resources when designing them. In particular, they must consider how to design water features in areas where water is scarce, so as to create green water features that are in line with sustainable development principles. (1) The principle of being small but efficient: In cities in the north where water is scarce, artificial water features in living environments should be considered carefully to minimize water consumption. Natural bodies of water such as ponds, pools, and rivers should be made full use of; efforts should be made to minimize the creation of large water surfaces. It is better to opt for smaller, more refined water features, using more point-like or linear water bodies. At the same time, during the design process, designers should take into account the maintenance of water bodies. For example, small water bodies have a limited area and weak self-circulation capabilities; how to facilitate water circulation and make cleaning easier, so as to truly achieve the principle that \"moving water does not rot,\" is an issue that requires careful consideration. (2) The principle of preferring lower locations over higher ones. Here, “lower” and “higher” refer to a relative concept; preferring lower locations means that the designed water features should align as much as possible with natural laws and the terrain. Apart from certain dryland fountains and small-scale ones, too many large fountains should not be designed. Since fountains mostly spray water upward, they require energy to counteract the effect of gravity, which means a significant amount of energy is needed. Therefore, in order to ensure that water features adhere to the principles of sustainable development, in practice it is best to make full use of gravity and the existing terrain, using as little energy as possible to create the most beautiful landscapes. Features such as waterfalls, small water screens, and water walls fit this view quite well. This type of water feature is actually a variation of a waterfall; it reduces the height difference of the water flow through a series of steps, thereby lowering water and energy consumption, reducing noise, and adding variety to the landscape. (3) The principle of preferring artificial to natural elements: In areas with limited water resources, artificial water features are also a good solution. The artificial water here is in contrast to actual bodies of water; it is an intentional water feature created by using landscaping elements characteristic of a particular region such as stones, sand, and wild grasses, to mimic the shape of natural water bodies in nature, thereby suggesting the idea of water. This design approach is also widely used in many areas with abundant water sources; for example, the road leading from Macau to the municipal government building uses local black and white sand and stones, laid in a curved pattern with alternating colors that resembles waves, achieving a very pleasing effect. Another example is the design of the river green space plaza in the Dajia section of the Keelung River in Taiwan, where patterns and models of marine organisms are integrated into the paving, naturally evoking the image of the ocean and thereby highlighting and deepening the theme. (4) The principle of giving priority to technology: What is most striking about modern urban water features is the visual effects created through the use of modern technological methods. Advances in science and technology have made the forms of water features more diverse and flexible. The use of various new materials and technologies also makes the sustainable development of water features possible. In the past, many water features wasted a great deal of water resources due to high consumption of materials and the lack of advanced design elements, causing a significant amount of water to be lost uselessly. The use of new technologies and materials enables the recycling of water, reduces the costs associated with water features, conserves a large amount of water resources, addresses water scarcity in many areas, and makes it possible to create water features. Many water-scarce cities can fully utilize rainwater, reclaimed water, seawater, solar energy, etc. to meet the needs of water feature design – options that were not available or feasible in the past. We can see that more forward-thinking communities have built large-scale wastewater treatment plants and rainwater collection and recycling systems within their areas. (5) Follow the principles of nature. Unreasonable planning and design of water features undoubtedly damage the existing natural environment, and in some cases, the damage may be irreparable. Therefore, designers should conduct a thorough investigation of the region’s natural environment, topography, and other characteristics in order to create water features that are in harmony with the local ecosystem. Secondly, in the construction of many water features, a thick waterproof layer is often laid at the bottom, thereby completely isolating the water from the surrounding environment; this also constitutes damage to the natural environment that existed there originally. Therefore, designers should make as few changes as possible to the existing terrain and landscape, and maintain a connection with the surrounding natural environment, in order to create green water features that conform to the principles of sustainable development. (6) Principles of sustainable development ① Principles of sustainable utilization of energy in water features: The energy consumption of water feature systems should, based on specific circumstances during design, make use of renewable energy sources as much as possible. If the conditions for using renewable energy are not available, low-energy consumption design solutions and equipment selections can also be employed. ② Adopt sustainable construction design principles, specifically: harmlessness – choose solutions that cause the least negative impact and damage to the environment, and avoid using materials that lead to exploitative destruction of other natural environments ； For example, avoid the extensive use of rocks that damage the mountain terrain. Ecologization – The design of water bodies, pond banks, rivers, etc., should facilitate the survival of organisms, plants, and fish in the aquatic environment ； Energy conservation – Evaluate design options from the life cycle perspective of the water environment in residential areas, and prioritize those with low energy consumption ； Integration – combining aesthetic and functional requirements, economic and practical aspects, ecological benefits and daily maintenance, as well as other related considerations ； ③ The sustainability of culture is reflected in the combination of tradition and modernity, as well as localized design. Managing the natural environment often requires simultaneous efforts to manage the human-made environment in order to achieve effective results. For example, without the concept of urban sanitation and the corresponding institutional support, it is impossible to address urban environmental pollution. Seven cities in China are among the top 10 for environmental pollution, and this is less due to their level of economic development and more to a lack of cultural elements that would be appropriate for such a level of economic development. Culture is the soul of the urban environment. An excellent residential area should not only blend seamlessly with the surrounding natural environment but also possess cultural significance, integrating with the nation’s cultural traditions. To build a sound society, a favorable cultural environment is essential; only then can the development of such a society be sustainable. Conclusion: A sustainable water environment in residential areas is an integral part of an ideal living environment. The design of a sustainable water environment in residential areas is the result of coordinated efforts by multiple disciplines and professionals. In the design of sustainable water environments in residential areas, it is necessary to avoid overly idealistic and rash approaches. Instead, decisions should be made based on the specific circumstances of time, place, and type of settlement, taking into account various factors such as the natural, economic, and cultural conditions of those areas. The acceptance level of property owners and residents must also be fully considered. It is important not only to create ecologically sustainable water environments but also to ensure their sustainable operation and use. In short, creating a sustainable water environment in residential areas is a daunting task, but the demands of the times require us to abandon an economic development model that comes at the cost of environmental degradation and adopt a sustainable approach instead. References: 1. Zhu Junzhen, The Art of Water Management in Gardens, China Forestry Press, Beijing, 1998. 2. Xia Yun et al., Ecology and Sustainable Architecture, China Architecture & Building Press, Beijing, 2001. 3. Wang Wei, Humans, Nature, and Sustainable Development, Capital University Press, Beijing, 1992. 4. Chen Jingsheng et al., Human-Environment Systems and Their Sustainability, The Commercial Press, Beijing, 2001. 5. Lin Qibiao et al., Design of Residential Living Environments, South China University of Technology Press, Guangzhou, 2000