Changes of vegetation pattern of Dilli Reserve Forest under Sivasagar Forest Division, Assam has been studied owing to invasion of aggressive smothering vine Mikania micrantha during 2014-2017. Dipterocarpus retusus was the predominant element in the upper canopy layer of natural forest site which grown gregariously in well drained alluvial plains of the foothills of Patkai range having IVI of followed by Mesua ferrea (), Artocarpus chama () and Vatica lanceaefolia (). | Forest tends transformation in the course of invasion of Mikania micrantha kunth ex hbk. in Dilli reserve forest of assam - Emphasis on vegetation characters