This study aimed to evaluate using Astragalus caragana , Astragalus cyclophyllon and Astragalus podolobus species for rehabilitation of rangelands in the central Zagros. Improper use of land increases erosion, loss of soil fertility and finally low income for landowners and farmers. Five separate experiments were conducted in this project. In the first stage, the potential distribution of mentioned Astragalus species were studied using the presence data and 22 environmental variables in Isfahan province using a maximum entropy method (Maxent). The results showed that most of the notable potential habitats for these species were expected in the south, west and south-west of the province . The model showed a good agreement with the actual distribution of these three species in natural habitats. In the second stage, methods and seasons of planting were studied in an experimental site in Fereydonshahr on Astragalus species and alfalfa (as control). Field experiment was conducted in a completely randomized design with factorial arrangement with Astragalus species and alfalfa in two planting seasons (fall and spring), as well as two planting methods (normal and pitting) in five replications. The experiment was carried out during growing season of 2012-2013 and 2013-2014 in Fereydonshahr study site. Astragalus podolobus was more suited to the climatic conditions of the study area than other species. Results of 2013-2014 planting showed that fall planting for A. cyclophyllon (both methods) and spring planting for A. caragana (pitting) and A. podolobus (normal) were more successful. In the third stage, the ability of nitrogen fixation of Astragalus species and alfalfa were evaluated in greenhouse where Bromus inermis was used as control. Five replications in a completly randomized design were used in this experiment. In order to identify the diazotrophic microsymbionts from the root nodules of these Astragalus species, partial 16S rDNA sequence analysis was used. The results showed that the N content of planted soil specially of M. sativa was significantly higher than that of control. The identified diazotrophic bacteria were Stenotrophomonas maltophilia , Hoeflea anabaenae , Mesorhizobium tianshanense and M. temperatum isolated from the roots of the plant species. In the fourth stage, effects of clipping (harvesting intensity and frequency) of Astragalus species and alfalfa on forage production was investigated. These species were grown in cylindrical pots (20 cm diameter and 100 cm height). Six months after estabilishment and growth, they were harvested at different levels of intensities and frequencyes. Results showed that in overall, alfalfa and A . caragana were tolerant to medium harvest intensity and frequency and A . cyclophyllon as well as A. podolobus were more sensitive to harvest intensity and frequency in the first growing season. In the fifth stage, a seed pletting experiment was conducted in to evaluate effects of delaying of seed emergence and increasing seedling establishment of these species. Delayed seedling emergence for preventing early frost during fall season is important for sensitive species such as alfalfa. Seeds were pelletd with Sepiolite a hydrophobic agent for this purpose. For decreasing emergence time in the spring planting, seeds were treated with hydrogel substance. This experiment was carried out in Isfahan university Technology campus open site. Results showed that between the studied species, pelleting Sepiolite on alfalfa seeds compared to control delayed emergence for a longer period than other species. In general this treatment is suitable for avoiding seedling from frost killing in the fall. The results demonstrated no significant difference between seeds treated with hydrogel compared to control. Key words : Maximum Entropy, Planting Time and Planting Methods, Nitrogen Fixation, Harvesting Intensity and Frequency, Pelleting.