Abstarct: Urban development poses multiple problems, including environmental pollution, a reduction in biodiversity, and the disappearance of the natural environment. Man-made environments and structure consume a large amount of limited natural resources through their extensive use of energy and materials. This research explored the use of vegetation in building sur-face as a potential solution to the problems of urban ecology and the ex-cessive energy consumption in buildings. Vegetated facades have the abil-ity to reduce building energy use, reduce the urban heat island effect, im-prove air quality, and increase the biodiversity of plants and animals in cit-ies.The goal of this research was to evaluate the effect of green walls on building thermal performance. To compare the thermal performance of building walls covered by vegetation, we used thermocouple and humidi-ty data loggers, weather station and thermal camera to data collection. Lo-cation of experimental test is in hot and dry climate of shahrood city in Iran. The experimental test include 3 exterior living walls whit different plant species, was built in shahrood University of technology. The result shown that the vegetation laxyer whit living walls panels as a substrate, can significantly effect on the exterior surface temperature and heat-related fluctuations on the wall and also reduction the interior wall surface tem-perature.