Abstract:There are 114 species of invasive plants belonging to 80 genera, 36 families in Guangxi Province. The most abundant family is Compositae including 26 species. The plants all immigrated from aboard and 87 species (76.3%) are mainly from America. There are 90 species of Herbs amounting to 78.9% of the total species. The plants were introduced intentionally or unconsciously. They, especially poisonous or virulent weeds, have produced large negative effects on agriculture, forestry, human health and ecological environment in Guangxi. The effective approaches to defend against invasive plants are as follows: to investigate and evaluate invasive species, to recover native vegetation and species diversity, to implement risk analysis of invasive plants.