| It was found that there were 33 species of invasive plants with 18 Family and 31 Genus in Leigong Mountain National Nature Reserve through field investigation and literature review. The majority species was compositae with 7 species. Invasion grade were dominated by low grade, living form were mainly perennial herb, origin were mainly not clear, invasive type of the accidentally transmission were dominated. There were invasive plants distributed in different functional areas, but the difference was not obvious, there were 15 species, 14 species and 13 species of invasive plants in experimental area, buffer area and core area, respectively. The difference was obvious in different vegetation type of wasteland, shrub forest, arbor forest, the species number were 20, 14 and 10. Hazard coefficient based on important value and risk rating of invasive plants, Hazard coefficient of Bidens pilosa(73.71), Galinsoga parviflora(55.76), Trifolium repens(51.17) were high, but Leigong Mountain National Nature Reserve was not massively invaded by them.