Eco-town is a living environment with harmonious development of society, economy and nature, efficient utilization of material, energy and information, and virtuous ecological cycle. Among them, people and the natural environment are harmonious and mutually beneficial, materials, energy and information are used efficiently, science and technology are fully integrated with nature, people's creativity and productivity are brought into full play, and residents' physical and mental health and environmental quality are protected to the maximum extent. To build an ecological small town, we must firmly grasp four eco-environmental protection systems: First, the industrial system of circular economy. It mainly involves three major industries: ecological industry, ecological agriculture and ecological service industry. To develop eco-industry, we should vigorously promote clean production technology and comprehensive utilization technology of resources, and build eco-industrial parks where conditions permit; To develop ecological agriculture, we should take pollution-free agricultural products and green food as the leading factors and adjust the industrial structure; To develop eco-service industry, we must run eco-tourism, green hotels and various green service industries well. The second is the urban infrastructure system. Emphasis includes water system, energy system, transportation system and building system. Water supply system. We should actively prevent and control floods and droughts and turn antagonism into adaptability. When building houses in cities and towns, some wetlands, ponds, ditches and depressions should not be filled and developed, let alone covered with cement slabs and built on them. Although water is accessible, the ecological function of underground ditches for flood control is far less than that of open channels. It is necessary to protect drinking water sources, let people drink clean water, minimize the use of groundwater and prevent the surface from sinking; It is necessary to strengthen water-saving awareness, develop water-saving agriculture, water-saving industry and water-saving service industry, and establish a water-saving society; It is necessary to establish a "hydrophilic" consciousness, build a good urban water network and form a good river landscape and waterfront environment, which can not only provide residents with suitable entertainment venues, but also raise the surrounding land price. Energy system. Energy is the driving force and important foundation for the normal operation of production and life. We should vigorously carry out energy conservation and consumption reduction, promote renewable energy, and promote the use of biogas and solar energy; We should vigorously develop small hydropower in mountainous areas; Where there is geothermal energy, it should be developed; In coastal areas, tidal energy should be developed; Where there is wind energy, we should develop it. Transportation system. Traffic is an important infrastructure for the development of small towns. According to the long-term population size of small towns and the needs of economic and social development, scientifically and reasonably design the urban road layout network to ensure safe, smooth, comfortable, energy-saving, pollution-free and land-saving; It is necessary to pay attention to building roads into ecological avenues and achieve "six good", that is, roads have been repaired, trees have been planted, houses have been built, fields have been planted, clean production has been done well, and safety, civilization and hygiene have been done well. Building system. It is necessary to actively adopt new materials, new technologies and new processes that are environmentally friendly and properly handle construction waste; It has distinct personality and regional characteristics and is in harmony with the surrounding natural environment; We should give full consideration to the adaptation to water system, energy system and transportation system, so as to achieve integrity, coordination and adaptability. The third is the ecological and environmental protection system. The greening of small towns should not only plant grass, but also scientifically match trees, irrigation and flowers, and mix needles and broadleaves; It is necessary to emphasize the ecology, adaptability, economy, demand and appreciation of tree species structure selection to form a multi-species, multi-level, harmonious and stable biological community; In the periphery of small towns, patches of forests or forest belts can be built to play a variety of ecological functions such as regulating climate, purifying air, maintaining soil and water, beautifying the environment and so on. To build an ecological small town, it is necessary to separate rain and sewage, and make a fuss in the "small and micro" environment when it is impossible to build a complete sewage treatment plant. Because of the low cost and good effect of anaerobic fermentation in biogas digester, it can be widely used. The sewage treated by anaerobic fermentation in biogas digester can reach the second-class water quality and can be reused as reclaimed water. It is necessary to integrate the management system of domestic waste in small towns into the whole social, economic and environmental system, and gradually realize that domestic waste treatment is harmless to the environment, gives back resources and does not increase the economic burden through comprehensive management from the source of waste generation to final disposal. The site selection of small towns should fully consider the impact of natural disasters on urban construction and avoid being plagued by natural disasters due to improper site selection. Such as avoiding the construction of towns in places with frequent geological disasters; Flood control measures should be taken to build towns downstream of the reservoir; Don't occupy riverbeds, rivers, etc. The fourth is the social institution system. The construction of small towns should coordinate science and technology, education, culture, health and sports, especially the construction of public health system, pay attention to the coordinated development of economy and society, between urban and rural areas, between regions and between man and nature, pay attention to the government's social management and public service functions, and comprehensively improve people's material life, cultural life and health level.