The EU Biodiversity Strategy for 2030 sets out a comprehensive framework of commitments and actions to tackle the main causes of biodiversity loss. Despite the growing concerns regarding the problem of phytoinvasions, the understanding of the mechanisms that determine the distribution and abundance of invasive plant species, on a local or regional scale, is still limited. Thus, researches regarding the rapid identification of invasive and potentially invasive species, their monitoring, highlighting the adaptive particularities of invasive species, become extremely necessary, understanding the ecophysiological responses of invasive species and their adaptation mechanisms being essential to predict the spread, especially in changing environmental and climatic conditions. The present study is focused on the inventory and analysis of the distribution of the invasive species Ailanthus altissima (Mill.) Swingle in the ,,Orheiul Vechi" protected area. Observations on invasive and potentially invasive plant species in the reserve were carried out during the years 2021-2023. The method of linear transects was used to assess the distribution of the species A. altissima, by direct observation (visual marking). Observations in the field were carried out during the summer-autumn and winter, when the phenotyping of the species is easy to achieve. In order to identify the distribution corridors of this species in the ,,Orheiul Vechi" protected area, the abundance and distribution of A. altissima populations in the given area was analyzed. The five-interval DAFOR scale was used to determine the frequency of A. altissima in the dendroflora of Butuceni and Morovaia villages and on the section between these villages. The GPS application was used for the exact location of the populations. It has been established that the number of trees with the highest height and thickness of the stem, but also the number of mature individuals with seeds is attested in the village of Morovaia and in the segment between these two villages. According to the DAFOR scale, the species was cataloged as dominant, abundant and frequent in the village of Morovaia, while in the village of Butuceni it fell more often into the category of rare and occasional spread, which indicates that the species' spread corridor has the Morovaia-Butuceni vector. Taking into account the imminent danger of invasive species, their early detection, early eradication and systematic monitoring are the most economically effective actions to avoid the further spread of the species in question, while understanding the mechanisms that allow a rapid population growth of exotic species is an important step in the process of controlling existing invasions and preventing future invasions.