在高密度城市构筑可持续发展的生态人居环境，已成为我国城市建设函待解决的问题。澳门是亚洲高密度城市的典型，未来发展定位为“世界旅游休闲中心”，必须打造生态健全、景观优美的城市环境。行道树作为一个城市的“名片”，是城市绿化的主要骨架，对于提升城市形象起着至关重要的作用。针对澳门行道树目前存在树种单一、结构简单、抗逆性不强、景观不够丰富等问题，本项目拟充分发挥古树对当地环境的高度适应能力、性状稳定、养护成本低、文化内涵丰富等优势，运用科学的量化统计方法对澳门现有的行道树和古树根据不同区域和环境因素分别从文化效益、生态效益、景观效益、经济效益等方面进行综合评价与分级，建立一个以筛选行道树树种为目标的古树多因素多指标综合评价指标体系。研究结果可为高密度城市及滨海地区利用古树资源优化行道树树种结构，提高景观美学和人文价值，形成寿命长、抗性强且具地方特色的道路景观，合理选择行道树树种提供科学依据。

The construction of a sustainable ecological living environment in a high-density cities has become a problem to be resolved in urban construction in China. As a typical high-density city in Asia, Macao is positioned as a "world tourism and leisure center" in the future, and it is necessary to create a healthy and beautiful urban environment. As the "business card" of a city, street trees are the main skeleton of urban greening, which play a critical role in promoting the image of the city. In view of the current problems such as single tree species, simple structure, weak resistance and monotonous landscape of street trees in Macao, this project team intends to use the advantages of the old trees on the local environment adaptability, stable traits, low maintenance costs, and rich cultural connotation et al., to use scientific statistical methods to comprehensively evaluate and classify the current street trees and old trees in Macao according to different regions and environmental factors from the aspects of cultural, ecological, landscape and economic benefits, and to establish a comprehensive evaluation index system of old tree multi-factor and multi-index for the purpose of selecting tree species of street trees. Using old tree resources in order to achieve optimization of the structure of trees species, improve landscape aesthetics and the humanistic value, form a long life, strong resistance and with local characteristics of the road landscape for high-density cities and coastal areas to provide a scientific basis for reasonable selecting street trees.