Abstract: Variation of plant community composition with environmental parameters (Elevation, pH, nutrients in soil etc.) was presented with the aim of determining the relationship of vegetation with environmental parameters in an urban area. Vegetation patterns of an area of 4 km2 were studied between 1300-1800 m in the selected areas of Islamabad city. This area is relatively having wider open spaces and consequently more species diversity. Taking into consideration the importance of soil characters in determining a certain type of vegetation, soil analysis is given due importance. Cluster analysis showed the existence of two major communities with different dominants due to environmental factors acting upon it. Broussonetia papyrifera an invasive species and Dalbergia sissoo an indigenous species are dominantly separated in different communities. Canonical Correspondence Analysis (CCA) showed that soil moisture content, electrical conductivity, pH, Elevation, Ca+ and heavy metals were the major edaphic factors correlated with species distribution.