中文摘要：

城市街道是使用频率较高的公共户外空间，良好的物理环境是提高室外行人舒适度的前提条件。以广州4条不同等级和朝向的街道作为模拟对象，利用微气候软件ENVI—met对街道微气候进行模拟计算，发现街谷易形成局部高温区域，优化建筑界面形态可提高街谷风环境。通过提高街谷高宽比、优化建筑界面、增加通风廊道、加强路面透水性、提高绿化遮阳效率等多项城市设计策略协同作用，可以全面地提升街谷及附近街区的环境品质。改善街区整体微气候。

英文摘要：

Urban streets are used with high frequency, and therefore, a good physical environment is a prerequisite for improving outdoor pedestrian comfort. This paper takes four streets at different levels of road hierarchy and with different directions in Guangzhou for simtalation. Through the ENVI-met approach, it is found that street canyons are likely to become high-temperature areas. To compre- hensively improve the environmental quality of street canyons and the nearby neighborhoods and to better the micor-climate of the whole steets, the paper suggests appling design strategies such as raising the street canyon hight-width ratio, optimizing the architectural interface, increasing the number of ventilation corridors, improving the water permeability of pavement and improving the efficiency of green shading.