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森林的生态效益和社会效益的总值如净化空气、保持水土、保护动物、提供体息等方面的价值，已远远超过其经济价值。城市是一个开放的系统，集中了大量的人群，直接间接地消耗着数量惊人的动物植物和矿物资源。为满足其衣食住行的需要，要产生大量的生活、工业、交通三废和噪音。城市绿地及园林的建设不仅可提供人们观赏旅游文化休息的场所，更为重要的是可以维持生态平衡和创造良好的环境效益。要使城市绿地充分发挥其改善环境的功能，更好地满足居民游息活动的需要，达到美化城市的目的，就必须按照一定的原则，合理的组织绿化规划，布局绿地使之成为一个有机的系统。一方面要有效地防止三废污染，还要有充足的绿地空间，同时要与城市建筑，道路及其他公共建设相结合。
The total value of the ecological and social benefits of forests, such as air purification, soil and water conservation, animal protection and provision of information, have far exceeded their economic value. The city is an open system that concentrates a large number of people and directly and indirectly consumes an alarming number of animal plants and mineral resources. To meet the needs of their basic necessities of life, it is necessary to produce a large amount of waste, noise and industrial waste. The construction of urban green space and gardens not only provides the place for people to watch the tourism culture and rest, but more importantly, can maintain the ecological balance and create good environmental benefits. To make urban green space give full play to its function of improving the environment, to better meet the needs of residents to travel activities, to achieve the purpose of beautification of the city, it must be in accordance with certain principles, rational planning green planning, green layout layout to make it an organic system. On the one hand, it is necessary to effectively prevent wastes from being wasted, and to have plenty of green space. At the same time, they should be integrated with urban construction, roads and other public facilities.