Abstract: This paper deals with the impacts of the alien invasive plants on biodiversity in longitudinal range-gorge region of Southwest China. The longitudinal range-gorge region of Southwest China is a critical region for reserving biodiversity
and now this region has become a highly endangered region with more than 70 species of alien invasive plants. Among these invasive plants, Ageratina adenophora ( Eupatorium adenophorum), Chromolaena odorata ( Eupatorium odoratum), and Tithonia diversifolia are severely imperiling this region . The structure and functions of ecosystems in this region are badly destroyed with the consequences that, the native species are in the face of extinction, and that agricultural producers, animal husbandry , and forestry activities or even the ecological security are in danger. The damage of alien invasive plants in this region led to a great attention in our country . It is of great practical significance and scientific value to make a comprehensive study of the alien invasive plants of this region, to discover their principles of activity, to slow down their imperiling speed, to wipe out them from this region, and eventually to restore the ecological equilibrium. This paper gives a detailed description of the impacts of the alien invasive plants on the plants species diversity, plants community
diversity, ecosystem diversity, agricultural producers, animal husbandry, and forestry. At the end, the authors suggested several solutions to control and wipe out the alien invasive plants.

Key words: Biodiversity