Species distribution modeling is based on the relationship between the occurrence data of a given species and the environmental variables. Nowadays, in plant ecology, producing the species distribution map is being paid attention due to the expansion of statistical methods and geographical information systems. In this study aimed to evaluate to the efficiency of maximum entropy (MAXENT) model to predict to potential habitat of Astragalus adscendence, Bromus tomenttellus and Daphne mucronata and evaluate the effect of climate change on their habitats in Chaharmahal va Bakhtiari province. A total of 156 Species occurrence data (including 56 occurrence data for Astragalus adscendence , 44 occurrence data for Bromus tomenttellus and 56 occurrence data for Daphne mucronate ) were recorded for Earth navigation by using GPS and 19 variables derived from temperature and rainfall were used in the modeling process. The relationships between species occurrence data and selected environmental factors were explored with MAXENT and the potential distribution map for species were produced. The effect of climate change on geographic distribution of Astragalus adscendence, Bromus tomenttellus and Daphne mucronata were predicted using HADGEM2-CC general circulation model under two scenarios of medial RCP4.5 and pessimistic RCP8.5. The most important environmental variables affecting the distribution of Astragalus adscendence are temperature Seasonality and Mean Temperature of Wettest Quarter. The distribution of this species is greatly reduced under the influence of climate change scenarios. According to the extracted Response curve, this species prefers habitats with annual precipitation of 250-350 mm and the average temperature of less than 10 ° C. Also, the MAXENT model had a good function for modeling the habitat of this species with an index of AUC =91.2%. The most important environmental variable affecting the distribution of Bromus tomenttellus is Mean Diurnal Range and the habitat of this species increases under the influence of climate change scenarios. this species prefers habitats with annual precipitation of 100-150 mm and the average temperature of less than 10 ° C. according to the AUC (82.6%), the function of model is acceptable. The most important environmental variables affecting the distribution of Daphne mucronata are temperature Seasonality, Mean Temperature of Wettest Quarter and Mean Temperature of Coldest Quarter. The distribution of this species under the scenarios of climate change is greatly reduced, as it is expected that this species will be eliminated in Chaharmahal va Bakhtiari province in the future. according to the AUC index (89.1%), the function of the model is acceptable. It should be noticed that in this study only climatic factors have been used and the physical and chemical conditions of soil and the interaction between living organisms (competition, etc.) have not been investigated. These factors can also strongly affect the current and future distribution of the species. Keywords : MAXENT, Astragalus adscendene , Bromus tomentellus , Daphne mucronata , species distribution models.