The main objective of this research is to determine the most important climatic elements influencing on distribution of plant types in Charmahal province using multivariate statistical methods and geographical information system. This province is an area equal to 16532 square kilometers. For this purpose, a database of 71 climatic elements with great importance in relation with ecological condition of plant types was prepared. A 10*10 Kilometers geographical network was applied and 73 points were determined. Reduction of data matrix using factor analysis, varimax rotation and climate zonation by hierarchical cluster analysis of ward method, were the next steps of the research. Results obtained from this research indicate that 3 factors including temperature, rainfall and shining with 53.02, 35.1 and 3.7 percent of variance respectively, together with plant cover form 91.82 percent of total variance. Using these factor scores, 5 bioclimatic zones in charmahal province were determined. These zones are as follows: 1- humid and moderate bioclimatic zone 2- semi humid and cold bioclimatic zone 3- very humid and cold and high bioclimatic zone 4- semi humid and warm bioclimatic zone 5- semi arid and cold bioclimatic zone. The effects of factor analysis on these types show that temperature and rainfall are the most important factors in distribution of plant types in charmahal province. Quercus brantii make a most appearance in humid and moderate and also semi humid and warm bioclimatic zones. Elavation range of this Quercus is 860 to 1900 meters. This means that it changes more than 1000 meters. However variant species of Astragalus have an extended tolerance range. It seems that this species are in almost all climate regions. Key words: Charmahal province, climatic elements, multivariate statistical methods, factor analysis, cluster analysis.