Through comparing and analyzing street tree structure with tree species selection model in Beijing , China and Daejeon, South Korea, the species diversity and solve existing problems in two cities are expected to elevate that contributes to ecological, esthetical and social functions of the cities. After data collection and field surveys, the results indicate that the main problems of street tree in two cities (urban areas) were: low species diversity; few species occupy dominant rate of street trees in two cities; proportions of evergreen trees were low in two cities; simple and few planting patterns of street trees arrangement were adopted in two cities t proportion of exotic trees was extreme low in Beijing occupying about 6. 3% of street trees, while in Daejeon, the proportion of exotic trees was high, occupying 66.1% of street trees; many short-life species but few long-life and precious tree species were planted in Beijing; street tree species composition in Daejeon lacked local legibility. Other, after analysis, many tree species can be introduced between two cities to triaL%通过对北京市和大田广域市城区行道树的比较和分析,解决两城市街道树的既存问题,丰富树种多样性,从而提高行道树的生态、美学、和社会功能.通过建立树种选择模型为树种的选择和引进提供标准和参考依据.数据调查结果显示:北京和大田广域市城区行道树系统主要存在以下问题.两个城市行道树树种多样性的不足,仅少数几个树种占据了行道树总量的绝大比例；两个城市行道树种中,常绿树种的比例过低；两个城市行道树的种植方式和模型过于简单；北京城区行道树种中外来树种的比例过低,仅占了行道树总量的6.3％,而大田广域市的行道树种中外来树种所占的比例过高,达到了66.1％；北京的行道树种中短生命期树种过多,而长期树种和珍贵树种缺乏；大田广域市行道树种的组成缺少地域特色.通过分析比较,发现北京和大田广域市之间行道树种的相互引进是可行的.对于彩叶树种、观果树种、观花树种的选择和引进也具有重要意义,不仅可以美化街道景观,还有促进建立稳定的绿色街道系统作用.
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