Abstract: According to the resulte of observation, there axe 107 Species of vascular plants in the Forma Quereus mongolica tha located in E. Hebe. for are 55 species of temperate floristic elements (51.4% of the total peies), 32 peies of E.Asia floristic elements (29.9%) and 20 species of endemic floristic ele- ments to China (18.7%). The author for the floristic elements on the tree layer, shrub layer, hebaceous layer and liana. The results of the floristic elements analyses of the Forma. Quercus mongolica standed for the temperate nature of the Forma and the areas where the Forma distributed.

Key words: Quercus mongolica