As the name implies, windcatcher is a part of the building’s framework of the hot and dry or wet and dry climates of Iran, in which by directing the windflaw and enjoying the clean energy of the nature has a particular rule in coordinating the residential space to a comfort temperature for human being. In this study Semnan has been selected as a case study of warm and dry area. The method of study is descriptive- analytical and the reason for choosing the samples is their proximity to each other and their differences in the size and other key features of the wind catchers. Typology has been done by analyzing the common features and patterns of the wind catchers, for this reason the through research on the windcatchers of the Yazd houses written by dr. Mahnaz Mahmoudi has been used. Also, in the study architectural proportions of the wind catchers has been examine and finally the differences between all these windcatchers and finding the best form from the thermal function perspective has been reported. The results of this study would be applied for the development of this element in in today’s modern architecture.