Abstarct: Due to the need for desalinated water in different parts of the country, some of this requirement was achieved by production of desalinated water in small-scale. According to the proper solar radiation in areas that are frequently faced with the problem of drinking water supply, one of the ideas in this field is solar desalination. Production of water by air humidification dehumidification (HD) is one of the novel technologies for water production which has been developed in recent years. On this basis, the method is baxsed on that the air has the potential to absorb and transport the significant amount of steam. HD desalination has three main parts: humidification, dehumidification and the heater part. Ratio of thermal energy consumption of this method is lower than the conventional desalination systems therefore this method can be a good choice for low populated remote areas of desert. In this paper, after reading the field and identify the types of operating systems, evaluation the effectiveness of new methods of extraction and injection are performed. Then the cycle was modeled by presenting the Mass balance equations and thermodynamic analysis and for defined operational conditions, the methods for optimizing was expressed. The results show that using the extraction and injection methods, even with the limitations of the existing collector areas, always can lead to an optimal point which the production of fresh water in it increases dramatically. This optimal condition was also studied for systems with different part of heating.