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A study was carried out to determine the vegetati.. n at altitudes between 1350-1500 meters in Eastern Ardebil forests. Using Broun Bhinquet" s R", ldom-Systematic sampling method, necessary samples with an inter nsity of 1.3 percent were collected. The total number of the plots selected sampling was 65. The findings of the phytosociological study shows 136 plant species in the area of which 131 species are Magnolophyta (109 species are Dicotyledon and 22 species are Monocotyledon), 4 species of Polypodiophyta (Ferns), and one species of Bryophyta (Moss). Also there exist 8 species of trees, 22 species of shrub, and 101 herbal species. The results of the study show that altitudes have effect on the diversity and the density in two Associantion of Quercus-Coryletum and Acero-Coryletum Vegetation. However, the slope and the aspect of the selected plots play a significant role in determining the vegetative variation. Furthermore, the study also indicated 3 plant associations in the area as bellow. Quercus-Coryletum Association: Located at altitudes of 1380 1460 meters on different slopes of 5-35 percent, mostly in the southern and the south-western aspects on loam silty soils with coverage, of 75-100 percent. Fageto-Coryletum Association: located at altitudes of 13 70-1500 meters on different slopes of 10-60 percent, mostly in the norhthern and the norhth-western aspects on loam silty soils with coverage of 80-100 percent. Acero-Coryletum Association: located at altitudes of 1440-1500 meters on down slopes of 2-15 percent in the south aspects on loam silty soils with coverage of 75-100 percent.