摘要：Ecological design is defined as any form expression that minimizes environmentally destructive impacts by integrating itself with living processes. Ecological design is an integrative ecologically responsible design discipline. Layout of climate is one of the basics for the ecological design of Semnan. In this regards, the ecological design and the architecture of the city of Semnan are the means through which the city reinvents its identity and its structure and renews its face. Creating of healthy and restful occupant environments for human becomes one of the main infrastructure challenges upon modern ecological design and architecture which provides human health. Undoubtedly, there are also reasons for being optimistic upon the level of physical and mental wellbeing of individuals, reducing the incidence of diseases, and/or might reduce their total fuel consumption with adverse health effects, and environmental pollution. In the climate-related topics, the architecture of the building is considered with the climatic conditions of each region, which will result in more human comfort and energy saving in order to control the environmental conditions. The purpose of this research is to identify and review the architectural style and ecological design of the city in accordance with the climate and the climate guidelines that can be used in the areas of stability, comfort, beauty, health, energy efficiency, and the use of important climatic parameters (temperature, relative humidity, ...) extracted from the data bank of the Semnan Synoptic Station (1965-2005) and the Terjung Environmental Indexes. The thermal comfort conditions of the private and public bodies of Mahani and Givoni were reviewed and analyzed for the establishment of the buildings and seasons of the year. The results show that the weather is very cool at night in the months of March and October which are acceptable on the day in comfort area, and June, July and August are acceptable at the level of comf