Road is an important component of urban greening system because it is an important aspect of measuring a level of urban greening. Street trees as an crucial proportion played a very important role in beautifying environment and improve life level. In this paper, I conducted a survey on the related tree species in Yuncheng city and gave an analysis on characteristics and vertical structures of them. The main street trees in Yuncheng are composed of 8 arbors and 3 shrubs. The main street trees are Sophora japonica Linn, Platanus orientalis L, Ligustmm lucidum Ait. , Prunus ceraifera cv. Pissardii and Albizzia julibrissin Durazz, etc. The recommendations are of developing native species, increasing the ratio of evergreen trees and ornamental trees, focusing on the conservation of cultivated species, and introducting some foreign good landscaping trees.%道路绿化是城市绿化系统的重要组成部分，它是衡量一个城市绿化水平的一个重要方面。行道树作为城市道路绿化的骨干材料，它在美化环境及改善城市生态生活条件方面起着尤为重要的作用。通过对运城市区的相关树种进行了调查，对行道树的种类，特征及水平垂直结构的配置都进行了分析：运城主要行道树为乔木8种，灌木3种；主要行道树为国槐、悬铃木、女贞、合欢和紫叶李等，并提出了合理建议：大力发展乡土树种；增加常绿树种和观赏树种的比例；注重栽培树种的养护；适当引用国外一些优良的园林绿化树种。
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