This research wasconducted to identify and analyze the effects of some invading plants onrangeland ecosystems. The aggressive plant isan indigenous or non-indigenous species that expands its territory by enteringa region, threatens biodiversity and entails adverse economic and environmentalconsequences. In this study, in order to samplingvegetation and soil, four rangelands were selected in Frydown and FereydounShahr. In each rangeland location, three transects of 100 meters in theopposite direction of the slope and at a distance of 50 meters spaced apart andin the direction of each transect, five plots were spaced 20 meters from eachother and the crown cover of all plant species was recorded. Five plots were randomly selected from soildepths of 0-10 and 10-30 cm, and the percentage of gradient and altitude fromthe sea level were recorded in each rangelands.In each rangeland location, 4 soil profiles were drilled to determine thehorizons of soil. The average of soil acidity, electrical conductivity, sodium,calcium, magnesium, absorbed phosphorus and potassium content, lime percentage,organic matter, microbial respiration and sand, clay and silt content of fourrangelands were analyzed by analysis One-way variance and Tukey's meancomparison were performed in the software environment Minitab 16. Investigation of the relationship betweenenvironmental factors and vegetation was done by parametric analysis ofprincipal components analysis (PCA) and non-parametric vegetation analysis(NMSD) in CANOCO and PATN software. Cluster analysis was used for grouping ofhabitats and sampling plots. The results of cluster analysis with the parametric regression (PCA)results showed that the main components of the first and second ones with themean precipitation, elevation, gradient and nitrogen, calcium and averagetemperature showed a strong correlation. Also, non-parametric regression analysisshowed that 5 plant species and 7 environmental variables had a significantcorrelation (p 0.05) with the three-dimensional space, and among the targetspecies The study of Eryngium billardieri showed a significant positivecorrelation with mean rainfall, altitude, gradient, calcium, nitrogen andnegative correlation with temperature and rock and gravel.Analytical hierarchy analysis was used to model the riskanalysis of invading plants. The factors used include three main criteria andeight sub-criteria and five options. Major criteria include the effects, aggression, and expansion potential ofinvading herbs, which were analyzed for Eryngium billardieri, Poa bullbosa,Phlomis persica, Euphorbia decipiensis and Cousinia bachtiarica species . For weighting the criteria and options withthe hierarchical analysis process, a linguistic scale was used to express theimportance of the factors and the results of evaluation of distributedquestionnaires among the rangeland experts. Then, the compatibility ratio ofeach criterion was calculated for checking the weight of the criteria byEexpert Choice software. The results showed that plant species Cousinia bachtiarica, Eryngiumbillardieri, Phlomis persica, Euphorbia decipiense and Poa bulbosa have moredestructive effects, respectively. In order to control the invading plants inthe west of Isfahan province, these species are prioritized. The method used inthis study can be used as a guide for evaluating other invasive species indifferent ecosystems.