this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using randomize systemically design (rsd) was giving. the plot size was 30*30 m2. in each plot, all site gradiant characteristics, plant species and their canopy cover were recorded. ecological species group regulation, determined relashionship between mixture species and gradient characteristics, and site classification, were carried out by applying two-way indicator species analysis (twinspan), detrended correspondence analysis (dca) and cononical correspondence analysis (cca) methods respectively. the results showed that number of 5 ecosystem units (3 unit in protect area and 2 unit in destroy area) in study are was identified. also results of cca method indicated that, the most importance environmental characteristices in separate species were include; ph, percent of c/n, mg, n, p, percent sand, clay, slope organic matter, litter mass, cover stone abundance and diversity indicators such as sanoon-vinner and sympsoon, species richness indicator such as, menhing, spices evenness indicator such as sheldon and pilo respectively. results from detection analysis reveal that, sample plots were correctly classified (87 percent). analysis of vegetation showed that, the protected area has been high diversity, so as number of 6 tree species, number of 3 shrub speces and number of 96 herbaceous species was identified, which was belonge to 87 sex and 31 families. while in degrade area number of 3 tree species and number of 94 shrub species was identified which was belonging to 77 herbaceous sex and 25 families. as well as the density of regeneration in both tree and shrub in protected area was greater than destroied area.