A phytosociological, floristic and climatic comparison of common beech (Fagus sylvatica)-silver fir (Abies alba) forest is presented. According to the syntaxonomy, chosen forest belongs to associations Omphalodo-Fagetum and Galio-Abietetum in Slovenia; and to associations Luzulo-Fagetum, Lysimanchio-Fagetum, Scillo-Fagetum, Festuco-Abietetum, Goodyero-Abietetum, Helleboro-Fagetum,Buxo-Fagetum and Coronillo-Fagetum in the case of Spain. In Slovenia chosen forest are mainly found in Trnovski gozd, Kočevska region, Snežnik and Pohorje, while in Spain they are distributed only around Pyrenees. This comparison is made according to gathered samples integrated intoa synthetic table for the purpose of vegetation and floristic analysis. Finally, differential species of chosen forest in both countries are described.