The species composition and abundance of ground beetles and rove beetles inhabiting unexploited willow’s plantation (Salix viminalis) were investigated at four study sites in the suburban district of Rzeszów, Zalesie in 2011 and 2012. The beetles were caught using Barber’s traps‐ at each site four traps were placed. As a result of the investigation, 1.532 beetles were collected, including 22 ground beetles and 50 rove beetles. Both ground beetles (Col., Carabidae) and rove beetles (Col., Staphylinidae) are considered useful entomofauna since they are natural enemies of many pests, and help regulate the number of harmful insects, thus results in providing environment resistance to phytophagous insects. Leaving in the ecosystem unnatural shrubberies, for example, willow plantations excluded from the use, creatses new habitats for coleopterofauna, including species that are not only useful but they also enrich enviroment by increasing number of species inhabiting wooded land. The study also shows the presence of very rare species of the Staphylinidae and protected representatvies of the genus Carabus. That observation confirms the assumption of conservation unused functions monocultures.