Abstract: Bidens pilosa L., an exotic invasive species,is one of worst weeds in many croplands in southern China. However, there are few systematic summaries of its invasion capability inChina. Here, we reviewed the research progress about phenotypic plasticity of exotic invasiveB. pilosa and a congeneic native speciesBidens biternate (Lour.) under different environmentalconditions. The differences of seed germination between those two species under different light conditions, temperatures and soil depths were discussed. Their biomass allocation patterns andreproductive characteristics were compared under different light, water, temperature and soil nutrient conditions. The mechanism of successful invasion ofB. pilosa includes rapid propagation,wide ecological adaptation, and allelopathy of root exudates. Finally, prospects about B. pilosa for further studies were proposed and methods for management and control strategies  of B. pilosa invasion were summarized.

Key words: rainfall intensity, runoff modulus, biological soil crust, initial runoff generation time, soil erosion modulus