Natural gas production from independent sources of gas or associated gas and heavy hydrocarbons is in fact saturated with water vapor. Water vapor in the gas along pipelines and process equipment cause problems such as the formation of hydrates, corrosion and changing the flow regime (the clot) as well as lower heating value of the gas. Therefore, optimizing the energy consumption of water is allowed to bring the gas stream becomes very important. Therefore, the specification process input and output streams, process equipments and mechanical characteristics were evaluated using software package Aspen Hysys7.2 and select the appropriate equation of state (Peng Robinson) simulation was performed dehydration unit. In order to ensure the validation of the simulation process, the obtained data were compared with data in the map of PFD unit, subsequently; compare simulation data with operational information and correctness were approved equation used to predict data. The results showed that the circulating glycol (constant concentration) and the stripping gas can be achieved by maintaining the initial concentration, decreased. The stripping gas temperature does not effect in among and concentration of glycol circulation. Stripping gas used in the study station around 34 kg / h was very high, which can be reduced in the range of design about 16.36 kg / h (to achieve the same concentration). The results showed that the lean glycol circulation and the amount of stripping gas can be optimized in the unit, and the amount of stripping gas will often reduce about spec of design 16.36 kg / h).