Environment and development are two major themes facing mankind today. Since the 1960s, the world economy has recovered and the urbanization process has advanced, which not only accelerates the economic development, but also brings a series of urban energy and ecological environment problems. In the construction and development of some cities, there are behaviors that only pay attention to short-term economic benefits and ignore long-term environmental benefits, resulting in environmental pollution, waste of resources and ecological destruction. Therefore, the effective use of energy and the protection and improvement of human environment have become an urgent task for mankind. Since the World Commission on Environment and Development (WCED) put forward the concept of "sustainable development" in the report "Our Common Future" 1987, sustainable development has been generally recognized in all countries and regions of the world, and gradually introduced into all fields of social and economic development. Strengthening the supporting construction of urban infrastructure, perfecting urban functions, optimizing urban social, economic and ecological environment, constantly improving human survival and living conditions, and building a sustainable eco-city are the important goals that all mankind strive to pursue in the 2 1 century. 1. Urban Environmental Planning 1. 1 Urban Planning Overview Urban construction can no longer repeat the old road of promoting development only by increasing resource input, but must rely on progress, pay attention to ecological environment construction, build a resource-saving and ecological city, and maintain the coordinated development of economy, resources and environment. It is necessary to further adjust and improve the technical standards for saving water, energy, land and other resources, pollution control, disaster prevention and mitigation in urban construction, and incorporate them into the mandatory provisions of engineering construction to protect and promote urban environmental protection and ecological construction by legal means. 1.2 problems and measures in urban planning cities are the concentrated places where human beings have changed their living environment and created a high level of material civilization in the course of thousands of years of evolution. It is a unity of interaction, mutual restriction and interdependence between human-centered urban life, environment and social environment, and it is a huge and complex socio-economic complex ecosystem. It includes social structure, artificial structure, resource structure and ecological environment structure. It is a huge systematic project to realize the sustainable development of this multi-element, multi-media and multi-level artificial composite ecosystem. To do a good job in urban planning, we must: (1) Give full play to the role of market mechanism and promote water conservation and water pollution prevention. Conscientiously implement the State Council's policies on urban water saving and water pollution control, use market rules and price levers to promote the conservation and optimal allocation of water resources, improve the system of differential water prices and excessive progressive price increases for various types of urban water use, and adjust the collection standards of sewage treatment fees. It is necessary to increase the promotion of water-saving technologies and facilities. With the goal of recycling sewage, we will speed up the construction of sewage treatment facilities, strengthen the research and development of reclaimed water reuse technology and equipment, handle the relationship between centralized and decentralized facilities layout, pay attention to the safety and ecological effects of sewage treatment, and strive to build a water-saving and pollution-proof city. (2) Strengthen urban greening and improve the living environment. Strengthening urban greening construction is the basic work of urban ecological environment construction. We should conscientiously implement the "Notice of the State Council on Strengthening Urban Greening Construction" and take effective measures to improve the level of urban greening. It is necessary to formulate urban green space system planning, strictly delimit green space area, arrange green layout, strengthen the construction of urban green isolation belt, and form a green space system that combines trees, irrigation, flowers and grass, and connects points, lines, areas and rings. To promote urban greening construction, we must respect objectivity, proceed from local reality, and adapt the land to the trees, trees and grass. Urban greening should encourage the use of water-saving technologies and wastewater utilization, and minimize the water consumption for green space conservation. It is necessary to combine the adjustment of urban industrial structure with the organic renewal of the old city and increase the green area of the central area of the city. It is necessary to establish and strictly implement the "green line" control system for urban greening, and resolutely investigate and deal with all kinds of encroachment on urban green space. It is necessary to combine the adjustment of agricultural structure, encourage farmers to develop suburban greening, guide social funds for urban greening construction, increase land and capital investment in urban greening construction, and raise urban greening construction to a new level as soon as possible. (3) Focus on the reform of heating charge system and actively promote the reform of urban heating system. The welfare heating system and the old welfare housing distribution system formed under the planned economy can no longer meet the needs of the market economy system and the new monetization system of housing distribution, and are also important economic sources that cause serious waste of heating energy. The basic idea of promoting the reform of urban heating system is to change the implicit supplement into the open supplement, and gradually stop the traditional heating system contracted by the housing property unit or the employee's unit, and replace it with the direct payment of heating by households (heat users), commercialization of heating heat and monetization of heating subsidies. If new public buildings and residential buildings in cities and towns in heating areas use central heating facilities, heating systems with household metering and room temperature control functions must be designed and installed. Both public buildings and residential buildings should be gradually transformed according to the requirements of household measurement and controllable room temperature. Actively carry out household metering and charging according to heat consumption, and gradually cancel charging according to area, so as to better protect consumers' rights and interests and improve heating comfort and heat utilization efficiency. The reform of urban heating system is related to the vital interests of the majority of urban residents, which should be both positive and steady. Effective measures should be taken to ensure that low-income families keep warm in winter, maintain social stability and ensure the smooth progress of reform. (4) Strengthen the comprehensive management of urban environment. Actively create conditions, accelerate the organic renewal of the old city, focus on solving the problems of excessive development intensity, high population density, insufficient public facilities, congestion and dirty environment in the urban built-up areas, resolutely shut down or relocate projects with serious urban pollution, and eliminate illegal buildings. Popularize building energy-saving technology, improve urban civil fuel structure, and reduce and control urban air pollution. With accessibility, low pollution and low energy consumption as the goal, we will implement the urban transportation policy of giving priority to public transportation, promote the application of communication technology in urban public transportation dispatching management, and actively promote the modernization of urban transportation organization and management. The comprehensive management of urban environment is directly related to every family and everyone, and it needs to promote the extensive participation and close cooperation of the whole society. The construction and development of a city is not only the construction and improvement of material conditions, but also the construction and improvement of cultural spirit and moral consciousness. These two aspects should be well combined, promote each other and develop harmoniously. (5) Strengthen scientific and technological innovation around key areas to improve the living environment. Cities and towns are the gathering places of population and economic activities, and also the areas where all kinds of pollution are concentrated. Scientific and technological construction must focus on the improvement of the quality of human settlements, the relationship between meteorological environment and planning layout, infrastructure construction and ecological environment, and strive to control the pollution that may be caused by urban and rural construction activities. In several key areas that affect and restrict the further improvement of the quality of human settlements, such as sewage recycling, building energy conservation, chemical building materials, building steel, intelligent transportation, and housing industry modernization, we will strengthen scientific research, strengthen technology integration, and increase the promotion and application of technology. Start the demonstration project of sewage reuse in an all-round way. The towns in the east and middle routes of the South-to-North Water Transfer Project should take the lead in realizing the synchronous growth of sewage reuse and sewage treatment capacity; The newly-built urban sewage treatment plant should directly aim at the recycling goal, actively adopt advanced and applicable technologies and processes, and strive to achieve leap-forward development. Improve the supporting technical and economic policies, and promote the transformation of building energy efficiency from local pilot to large-scale popularization and application. Strengthen the application of advanced and applicable technologies in housing construction, transform mature technologies and parts tested by pilot and demonstration projects into productive forces as soon as possible, and promote the modernization of housing industry. 2. Urban ecological planning 2. 1 Urban ecosystem Urban ecosystem is an economic ecosystem centered on natural reproduction and reproduction, based on the ecosystem and aimed at human needs; At the same time, it is an organic ecological giant system with people as the main body and composed of life subsystem, subsystem and environment subsystem [3]. It is an important part of the urban system, and the two are inseparable. All kinds of urban activities are restricted by the ecological environment. On the contrary, excessive urban activities will in turn cause sustained damage to the ecosystem, thus endangering the entire ecosystem and human beings themselves [4]. Therefore, urban ecological planning is an important way to promote the coordinated development of urban society, economy and environment and realize sustainable development. 2.2 The connotation of urban ecological planning The report of the United Nations Man and Biosphere Plan (MAB, 1984) points out: "Eco-city (township) planning is to create an optimal environment that can fully integrate technology and natural human activities from both natural ecology and social psychology, induce people to create spirit and productivity, and provide a higher material and cultural living standard". Specifically, urban ecological planning is the planning of countermeasures, objectives and measures for urban ecological environment construction in a certain period of time. Its purpose is to improve environmental quality, maintain ecological balance and realize the sustainable development of the city. It follows the multi-disciplinary means related to ecology and urban planning, such as system science and environmental science, identifies, simulates and designs various ecological relationships in the artificial composite ecosystem, grasps the evolution of urban monetary ecosystem and its elements, puts forward feasible ecological planning schemes through the comprehensive layout and arrangement of subsystems in the urban ecosystem, and adjusts the relationship between urban human beings and urban environment, so as to maintain the balance of urban ecosystem and realize the harmonious, efficient and sustainable development of the city. Urban ecological planning is a planning method suitable for the concept of sustainable development. It combines ecological principles with urban master planning and environmental planning. Based on the natural elements and the laws of their development and evolution, it determines how human beings carry out social and economic production and life, effectively develop, utilize and protect these natural resources, promote the coordinated development of social economy and ecological environment, and finally realize the sustainable development of the whole region and city [5]. Therefore, urban ecological planning is different from traditional environmental planning and economic planning. It is a bridge connecting the overall urban planning, environmental planning and socio-economic planning. Its scientific connotation emphasizes the initiative, coordination, integrity and hierarchy of planning, and its goal is to pursue the harmony of social civilization, economic benefits and ecological environment [6]. 2.3 Sustainable urban ecological environment planning To realize the sustainability of urban ecological environment planning, it is necessary to innovate ideas, apply the basic principles of ecology and sustainable development, alleviate the contradictions existing in urban ecological environment, coordinate urban socio-economic development and urban ecological environment, prevent the destruction and pollution of ecological environment, and realize the harmonious development between man and nature. In order to ensure the sustainability of urban eco-environmental planning, the following principles should be followed: (1) threshold material law Any space and resource planning has a "degree", and "optimal" and "threshold" should be considered. In the process of planning, we should first establish the correct values of urban development, ensure that the city's demand for the ecosystem and waste discharge are limited within the carrying capacity of the ecosystem, make the development intensity of the city adapt to the development capacity of the city, and thus ensure the harmonious relationship between man and nature. (2) Diversity Principle * * * There is always a mutually beneficial relationship between subsystems in any system. Hoff commented, "If health is described as the ability to resist, then diversity also means health" [7]. Therefore, in the process of urban ecological planning, it is necessary to maintain biodiversity, plan urban ecosystem in the whole biosphere, establish a composite ecosystem of cities and suburbs, and protect all kinds of creatures in and around the city. (3) In the system, subsystems are always connected, and the harmfulness of one component may be reflected in another ecological element. In the process of urban ecological planning, we must generally contact and identify the close interest relationship between various components of urban ecological environment, find out the essence and root of the phenomenon, and thus reduce the negative impact of this relationship to a minimum. (4) The principle of recycling resources has two meanings: one is to reduce the consumption rate of resources; The second is to promote clean energy and increase the recycling of materials. In urban ecological planning, it is necessary to promote the evolution of industrial structure mode, minimize the consumption of natural resources, establish a production process conducive to sustainable development, establish an efficient industrial structure operation system, and improve resource utilization. (5) The principle that prevention and protection go hand in hand. We must take reasonable measures to deal with the existing ecological problems. Be proactive about unknown things that have not yet shown symptoms. The environmental impact assessment system (EIA) implemented in China is basically a part of sustainable urban ecological planning. Before any project is implemented, it is necessary to carry out environmental impact assessment, predict the benefits to society, economy and ecological environment after the project is completed, and put forward reasonable suggestions. At the same time, in the process of urban ecological environment planning, we should also establish a high-level management team, formulate a practical, scientific and reasonable comprehensive improvement plan for the ecological environment, and establish a high-quality environmental protection system; At the same time, gradually improve the green space ecosystem, improve the quality of the population and enhance people's awareness of environmental protection. Secretary hodgepodge network