Climatic design a suitable method to create location a variety of structures and immunization. Human comfort conditions combined with the reduction in overall energy cost and it is important in all kinds of weather.  The aim of this study is optimized for building deployment in Kashan city. The city most days of the year, is hot and dry and it is necessary to determine the best direction to protect the building from the sun in hot times and also Cold when the sun was enjoyed. In this study, the amount of solar energy that falls on the vertical surfaces of buildings as real and theoretical with computational methods law of cosines (Stevenson) have been. For separation of cold and warm periods, using hourly temperature of Arbz (Erbs) is used. The results showed that the most ideal way for the main facade of the building in the direction that the minimum energy when heating and when cooling is the most energy intake. Accordingly, the direction of 180 degrees or south to get 53.6 percent of the calories in cold cases and received 41.7 percent of the total heating energy in an appropriate direction to appear. Suitable direction double-sided buildings on the north - south. Because when warm 41.7% of the energy it receives and also in cold cases The greatest amount of energy received 53.5 percent. Best direction of a four sided suitable for buildings, especially apartment complexes and -30 direction +60 and -120 and is +150. Because when the heating value of 52.8% and 38.4% of the energy received in the cold cases.