Author in this book tries to find more new relationships between traditional buildings and climate. The studied cases are in tabriz, isfahan and yazd. So we need to study on climate of two area, Cold & mountain then Hot & Arid. Tabriz is located in cold & mountain climate and Yazd and isfahan based on Hot & Arid area. The reasons of study on climate is to find how it affect the in Iranian traditional architecture. The best element to use with is proportions.comparison of traditional buildings in both cold and ho t& arid regions indicates that every traditional building that has occurred in this area has been pursuant to climatic factors such as moisture, sunlight and solar energy, the prevailing winds, etc. Each individual climatic element is involved in the formation of buildings and spaces.